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IDT74FCT3574AQG8

Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, QSOP-20

器件类别：逻辑    逻辑   

厂商名称：IDT (Integrated Device Technology)

器件标准：  

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参数 预览 参数对比
器件参数
参数名称
属性值
是否无铅
不含铅
是否Rohs认证
符合
厂商名称
IDT (Integrated Device Technology)
零件包装代码
QSOP
包装说明
QSOP-20
针数
20
Reach Compliance Code
compliant
其他特性
BROADSIDE VERSION OF 374
系列
FCT
JESD-30 代码
R-PDSO-G20
JESD-609代码
e3
长度
8.65 mm
负载电容（CL）
50 pF
逻辑集成电路类型
BUS DRIVER
位数
8
功能数量
1
端口数量
2
端子数量
20
最高工作温度
85 °C
最低工作温度
-40 °C
输出特性
3-STATE
输出极性
TRUE
封装主体材料
PLASTIC/EPOXY
封装代码
SSOP
封装形状
RECTANGULAR
封装形式
SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）
260
传播延迟（tpd）
6.5 ns
认证状态
Not Qualified
座面最大高度
1.75 mm
最大供电电压 (Vsup)
3.6 V
最小供电电压 (Vsup)
2.7 V
标称供电电压 (Vsup)
3.3 V
表面贴装
YES
技术
CMOS
温度等级
INDUSTRIAL
端子面层
MATTE TIN
端子形式
GULL WING
端子节距
0.635 mm
端子位置
DUAL
处于峰值回流温度下的最长时间
30
宽度
3.9116 mm
文档预览
IDT74FCT3574/A
3.3V CMOS OCTAL D REGISTER (3-STATE)
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS
OCTAL D REGISTER
(3-STATE)
FEATURES:
• 0.5 MICRON CMOS Technology
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• V
CC
= 3.3V ±0.3V, Normal Range
• V
CC
= 2.7V to 3.6V, Extended Range
μ
• CMOS power levels (0.4μW typ. static)
• Rail-to-Rail output swing for increased noise margin
• Available in QSOP, SOIC, and TSSOP packages
IDT74FCT3574/A
DESCRIPTION:
The FCT3574/A are 8-bit registers built using an advanced dual metal
CMOS technology. These registers consist of eight D-type flip-flops with a
buffered common clock and buffered 3-state output control. When the
OE
input is low, the eight outputs are enabled. When the
OE
input is high, the
outputs are in the high-impedance state.
Input data meeting the set-up and hold time requirements of the D inputs
is transferred to the Q outputs on the low-to-high transition of the clock input.
FUNCTIONAL BLOCK DIAGRAM
D
0
CP
CP
D
Q
CP
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
CP
D
Q
OE
Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
NOVEMBER 2000
DSC-5417/5
© 2000 Integrated Device Technology, Inc.
IDT74FCT3574/A
3.3V CMOS OCTAL D REGISTER (3-STATE)
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
OE
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
CP
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
V
TERM(4)
T
STG
I
OUT
Description
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Max
–0.5 to +4.6
–0.5 to +7
–0.5 to V
CC
+0.5
–65 to +150
–60 to +60
Unit
V
V
V
°C
mA
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may
cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in
the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
2. V
CC
terminals.
3. Input terminals.
4. Outputs and I/O terminals.
QSOP/ SOIC/ TSSOP
TOP VIEW
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
3.5
4
Max.
6
8
Unit
pF
pF
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
D
X
CP
OE
Q
X
Description
D Flip-Flop Data Inputs
Clock Pulse for the register. Enters data on LOW-to-HIGH
transition.
3-State Output Enable Input (Active LOW)
3-State Outputs
FUNCTION TABLE
(1)
Inputs
Function
HI-Z
LOAD
REGISTER
OE
H
H
L
L
H
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
NC = No Change
↑
= LOW-to-HIGH transition
Outputs
Dx
X
X
L
H
L
H
Qx
Z
Z
L
H
Z
Z
CP
L
H
↑
↑
↑
↑
2
IDT74FCT3574/A
3.3V CMOS OCTAL D REGISTER (3-STATE)
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40°C to +85°C, V
CC
= 2.7V to 3.6V
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
ODH
I
ODL
V
OH
Parameter
Input HIGH Level (Input pins)
Input HIGH Level (I/O pins)
Input LOW Level
(Input and I/O pins)
Input HIGH Current (Input pins)
Input HIGH Current (I/O pins)
Input LOW Current (Input pins)
Input LOW Current (I/O pins)
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Output HIGH Current
Output LOW Current
Output HIGH Voltage
V
CC
= Min., I
IN
= –18mA
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= 3V
V
IN
= V
IH
or V
IL
V
OL
Output LOW Voltage
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= 3V
V
IN
= V
IH
or V
IL
I
OS
V
H
I
CCL
I
CCH
I
CCZ
Short Circuit Current
(4)
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Max., V
O
= GND
(3)
—
V
CC
= Max., V
IN
= GND or V
CC
–60
—
—
–135
150
0.1
–240
—
10
mA
mV
µA
I
OL
= 0.1mA
I
OL
= 16mA
I
OL
= 24mA
I
OL
= 24mA
—
—
—
—
0.2
0.3
0.3
0.2
0.4
0.55
0.5
V
I
OH
= –0.1mA
I
OH
= –3mA
I
OH
= –8mA
V
CC
= Max.
V
CC
= Max.
V
I
= 5.5V
V
I
= V
CC
V
I
= GND
V
I
= GND
V
O
= V
CC
V
O
= GND
—
—
—
—
—
—
—
–36
50
V
CC
–0.2
2.4
2.4
(5)
—
—
—
—
—
—
–0.7
–60
90
—
3
3
±1
±1
±1
±1
±1
±1
–1.2
–110
200
—
—
—
V
mA
mA
V
µA
µA
Guaranteed Logic LOW Level
Test Conditions
(1)
Guaranteed Logic HIGH Level
Min.
2
2
–0.5
Typ.
(2)
—
—
—
Max.
5.5
Vcc+0.5
0.8
V
Unit
V
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, +25°C ambient and maximum loading.
3. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
- 0.6V at rated current.
3
IDT74FCT3574/A
3.3V CMOS OCTAL D REGISTER (3-STATE)
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Dynamic Power Supply
Current
(4)
V
CC
= Max.
V
CC
= Max.
Outputs Open
OE
= GND
One Input Toggling
50% Duty Cycle
I
C
Total Power Supply Current
(6)
V
CC
= Max.
Outputs Open
f
CP
= 10MHz
50% Duty Cycle
OE
= GND
f
I
= 5MHz
One Bit Toggling
V
CC
= Max.
Outputs Open
f
CP
= 10MHz
50% Duty Cycle
OE
= GND
f
I
= 2.5MHz
Eight Bits Toggling
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
- 0.6V
V
IN
= GND
—
0.6
0.9
mA
Test Conditions
(1)
V
IN
= V
CC
- 0.6V
V
IN
= V
CC
V
IN
= GND
Min.
—
—
Typ.
(2)
2
60
Max.
30
85
Unit
μA
μA/
MHz
—
0.6
0.9
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
- 0.6V
V
IN
= GND
—
1.5
2.2
(5)
—
1.5
2.3
(5)
NOTES:
1. For conditions shown as Min. or Max., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
3. Per TTL driven input. All other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of
ΔI
CC
formula. These limits are guaranteed but not tested.
6. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
ΔI
CC
D
H
N
T
+ I
CCD
(f
CP
N
CP
/2 + fiNi)
I
CC
= Quiescent Current (I
CC
, I
CCH
, and I
CCZ
)
ΔI
CC
= Power Supply Current for a TTL High Input
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for register devices (zero for non-register devices)
N
CP
= Number of clock inputs at f
CP
fi = Input Frequency
Ni = Number of Inputs at fi
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
(1)
74FCT3574
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SU
t
H
t
W
Parameter
Propagation Delay
CP to Qx
Output Enable Time
Output Disable Time
Set-up Time HIGH or LOW, D
X
to CP
Hold Time HIGH or LOW, D
X
to CP
CP Pulse Width HIGH or LOW
Condition
C
L
= 50pF
R
L
= 500Ω
(2)
Min.
2
1.5
1.5
2
1.5
7
(3)
Max.
10
12.5
8
—
—
—
74FCT3574A
Min.
Max.
2
6.5
(3)
Unit
ns
ns
ns
ns
ns
ns
1.5
1.5
2
1.5
5
6.5
5.5
—
—
—
NOTES:
1. Propagation Delays and Enable/Disable times are with V
CC
= 3.3V ±0.3V, Normal Range. For V
CC
= 2.7V to 3.6V, Extended Range, all Propagation Delays and Enable/
Disable times should be degraded by 20%.
2. See test circuit and waveforms.
3. Minimum limits are guaranteed but not tested on Propagation Delays.
4
IDT74FCT3574/A
3.3V CMOS OCTAL D REGISTER (3-STATE)
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
V
CC
500Ω
V
IN
Pulse
Generator
R
T
D.U.T.
50pF
C
L
500Ω
V
OUT
6v
Open
GND
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other Tests
Switch
6V
GND
Open
Test Circuits for All Outputs
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
t
SU
t
H
t
REM
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
3V
1.5V
0V
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
1.5V
1.5V
t
SU
t
H
Pulse Width
Set-Up, Hold, and Release Times
ENABLE
CONTROL
INPUT
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE PHASE
INPUT TRANSITION
t
PHL
t
PHL
3V
1.5V
0V
V
OH
1.5V
V
OL
3V
1.5V
0V
t
PZL
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
6V
t
PZH
SWITCH
GND
1.5V
0V
3V
1.5V
t
PHZ
DISABLE
3V
1.5V
t
PLZ
0V
3V
0.3V
0.3V
V
OL
V
OH
0V
Propagation Delay
Enable and Disable Times
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
3. If Vcc is below 3V, input voltage swings should be adjusted not to exceed Vcc.
5
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参数对比
与IDT74FCT3574AQG8相近的元器件有：IDT74FCT3574ASOG、IDT74FCT3574PGG8、IDT74FCT3574PGG、IDT74FCT3574SOG8、IDT74FCT3574SOG、IDT74FCT3574QG8、IDT74FCT3574APGG、IDT74FCT3574APGG8。描述及对比如下：
型号 IDT74FCT3574AQG8 IDT74FCT3574ASOG IDT74FCT3574PGG8 IDT74FCT3574PGG IDT74FCT3574SOG8 IDT74FCT3574SOG IDT74FCT3574QG8 IDT74FCT3574APGG IDT74FCT3574APGG8
描述 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, QSOP-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, SOIC-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, TSSOP-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, TSSOP-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, SOIC-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, SOIC-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, QSOP-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, TSSOP-20 Bus Driver, FCT Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, TSSOP-20
是否无铅 不含铅 不含铅 不含铅 不含铅 不含铅 不含铅 不含铅 不含铅 不含铅
是否Rohs认证 符合 符合 符合 符合 符合 符合 符合 符合 符合
厂商名称 IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology) IDT (Integrated Device Technology)
零件包装代码 QSOP SOIC TSSOP TSSOP SOIC SOIC QSOP TSSOP TSSOP
包装说明 QSOP-20 SOIC-20 TSSOP-20 TSSOP-20 SOIC-20 SOIC-20 QSOP-20 TSSOP-20 TSSOP-20
针数 20 20 20 20 20 20 20 20 20
Reach Compliance Code compliant compliant compliant compliant compliant compliant compliant compliant compliant
其他特性 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374 BROADSIDE VERSION OF 374
系列 FCT FCT FCT FCT FCT FCT FCT FCT FCT
JESD-30 代码 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 R-PDSO-G20
JESD-609代码 e3 e3 e3 e3 e3 e3 e3 e3 e3
长度 8.65 mm 12.8 mm 6.5 mm 6.5 mm 12.8 mm 12.8 mm 8.65 mm 6.5 mm 6.5 mm
负载电容（CL） 50 pF 50 pF 50 pF 50 pF 50 pF 50 pF 50 pF 50 pF 50 pF
逻辑集成电路类型 BUS DRIVER BUS DRIVER BUS DRIVER BUS DRIVER BUS DRIVER BUS DRIVER BUS DRIVER BUS DRIVER BUS DRIVER
位数 8 8 8 8 8 8 8 8 8
功能数量 1 1 1 1 1 1 1 1 1
端口数量 2 2 2 2 2 2 2 2 2
端子数量 20 20 20 20 20 20 20 20 20
最高工作温度 85 °C 85 °C 85 °C 85 °C 85 °C 85 °C 85 °C 85 °C 85 °C
最低工作温度 -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C -40 °C
输出特性 3-STATE 3-STATE 3-STATE 3-STATE 3-STATE 3-STATE 3-STATE 3-STATE 3-STATE
输出极性 TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
封装主体材料 PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
封装代码 SSOP SOP TSSOP TSSOP SOP SOP SSOP TSSOP TSSOP
封装形状 RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
封装形式 SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度） 260 260 260 260 260 260 260 260 260
传播延迟（tpd） 6.5 ns 6.5 ns 10 ns 10 ns 10 ns 10 ns 10 ns 6.5 ns 6.5 ns
认证状态 Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
座面最大高度 1.75 mm 2.65 mm 1.2 mm 1.2 mm 2.65 mm 2.65 mm 1.75 mm 1.2 mm 1.2 mm
最大供电电压 (Vsup) 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V 3.6 V
最小供电电压 (Vsup) 2.7 V 2.7 V 2.7 V 2.7 V 2.7 V 2.7 V 2.7 V 2.7 V 2.7 V
标称供电电压 (Vsup) 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V 3.3 V
表面贴装 YES YES YES YES YES YES YES YES YES
技术 CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS CMOS
温度等级 INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL INDUSTRIAL
端子面层 MATTE TIN Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed MATTE TIN Matte Tin (Sn) - annealed Matte Tin (Sn) - annealed
端子形式 GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING
端子节距 0.635 mm 1.27 mm 0.65 mm 0.65 mm 1.27 mm 1.27 mm 0.635 mm 0.65 mm 0.65 mm
端子位置 DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL
处于峰值回流温度下的最长时间 30 30 30 30 30 30 30 30 30
宽度 3.9116 mm 7.5 mm 4.4 mm 4.4 mm 7.5 mm 7.5 mm 3.9116 mm 4.4 mm 4.4 mm
Is Samacsys - N N N N N - - -
湿度敏感等级 - 1 1 1 1 1 - 1 1
Base Number Matches - 1 1 1 1 1 - - -
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器件捷径:
E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF EG EH EI EJ EK EL EM EN EO EP EQ ER ES ET EU EV EW EX EY EZ F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF FG FH FI FJ FK FL FM FN FO FP FQ FR FS FT FU FV FW FX FY FZ G0 G1 G2 G3 G4 G5 G6 G7 G8 G9 GA GB GC GD GE GF GG GH GI GJ GK GL GM GN GO GP GQ GR GS GT GU GV GW GX GZ H0 H1 H2 H3 H4 H5 H6 H7 H8 HA HB HC HD HE HF HG HH HI HJ HK HL HM HN HO HP HQ HR HS HT HU HV HW HX HY HZ I1 I2 I3 I4 I5 I6 I7 IA IB IC ID IE IF IG IH II IK IL IM IN IO IP IQ IR IS IT IU IV IW IX J0 J1 J2 J6 J7 JA JB JC JD JE JF JG JH JJ JK JL JM JN JP JQ JR JS JT JV JW JX JZ K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 KA KB KC KD KE KF KG KH KI KJ KK KL KM KN KO KP KQ KR KS KT KU KV KW KX KY KZ
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