21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74LPT16646
3.3V 16-BIT REGISTERED TRANSCEIVERS
PI74LPT16646
Fast CMOS 3.3V 16-Bit Registered Transceivers
Product Features
• Compatible with LCX™ and LVT™ families of products
• Supports 5V Tolerant Mixed Signal Mode Operation
– Input can be 3V or 5V
– Output can be 3V or connected to 5V bus
• Advanced Low Power CMOS Operation
• Excellent output drive capability:
Balanced drives (24 mA sink and source)
• Pin compatible with industry standard double-density
pinouts
• Low ground bounce outputs
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Multiple center pins and distributed Vcc/GND pins
minimize switching noise
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 300 mil wide plastic SSOP (V)
1
2
3
4
5
6
7
Product Description
Pericom Semiconductor’s PI74LPT series of logic circuits are pro-
duced in the Company’s advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74LPT16646 is a 16-bit registered transceiver organized as
two independent 8-bit bus transceivers designed with 3-state
D-type flip-flops and control circuitry arranged for multiplexed
transmission of data directly from the data bus or from the internal
storage registers. Each 8-bit transceiver utilizes the enable control
(xOE) and direction pins (xDIR) to control the transceiver functions.
The Select (xSAB and xSBA) control pins are used to select either
real-time or stored data transfer. The circuitry used for select control
will eliminate the typical decoding glitch that occurs in a multiplexer
during the transition between real-time and stored data. A low input
level selects real-time data and a high selects stored data.
The PI74LPT16646 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator in a mixed
3.3/5.0V system.
Logic Block Diagram
1
OE
2
OE
8
9
10
11
B REG
D
C
2
DIR
1
DIR
1
CLKBA
1
SBA
2
CLKBA
2
SBA
1
CLKAB
1
SAB
2
CLKAB
2
SAB
B REG
D
C
12
2
B
0
1
A
0
2
A
0
A REG
D
C
1
B
0
A REG
D
C
13
14
TO 7 OTHER CHANNELS
TO 7 OTHER CHANNELS
15
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PI74LPT16646
3.3V 16-BIT REGISTERED TRANSCEIVERS
Product Pin Description
Pin Name
xOE, xDIR
xCLKAB, xCLKBA
xSAB, xSBA
xAx
xBx
GND
V
CC
Description
Output Enable Inputs (Active LOW)
Clock Pulse Inputs
Output Data Source Select Inputs
Data Register A Inputs
Data Register B Outputs
Data Register B Inputs
Data Register A Outputs
Ground
Power
Product Pin Configuration
1
DIR
1
CLKAB
1
SAB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
56-PIN
45
V56
44
1
OE
1
CLKBA
1
SBA
GND
1
A
1
1
A
2
GND
1
B
1
1
B
2
V
cc
1
A
3
1
A
4
1
A
5
GND
1
A
6
1
A
7
1
A
8
2
A
1
2
A
2
2
A
3
GND
2
A
4
2
A
5
2
A
6
V
CC
1
B
3
1
B
4
1
B
5
GND
1
B
6
1
B
7
1
B
8
2
B
1
2
B
2
2
B
3
GND
2
B
4
2
B
5
2
B
6
A56
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
V
CC
2
A
7
2
A
8
V
CC
2
B
7
2
B
8
GND
2
SAB
2
CLKAB
2
DIR
GND
2
SBA
2
CLKBA
2
OE
Truth Table
(2)
Function
Isolation
Store A and B Data
Real Time B Data to A Bus
Stored B Data to A Bus
Real Time A Data to B Bus
Stored A Data to B Bus
xOE
H
H
L
L
L
L
xDIR
X
X
L
L
H
H
Inputs
xCLKAB
xCLKBA
H or L
H or L
↑
↑
X
X
X
H or L
X
X
H or L
X
xSAB
X
X
X
X
L
H
xSBA
X
X
L
H
X
X
Data I/O
(1)
xAx
xBx
Input
Input
Output
Input
Input
Output
Note:
1. The data output functions may be enabled or disabled by various signals at the xOE or xDIR inputs. Data input functions are
always enabled, i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.
2. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level,
↑=
LOW-to-HIGH Transition
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PI74LPT16646
3.3V 16-BIT REGISTERED TRANSCEIVERS
REAL-TIME TRANSFER
BUS B TO A
REAL-TIME TRANSFER
BUS A TO B
1
2
3
4
5
BUS
A
BUS
B
BUS
A
BUS
B
xDIR
L
xOE xCLKAB xCLKBA
L
X
X
xSAB
X
xSBA
L
xDIR
H
xOE xCLKAB xCLKBA
L
X
X
xSAB
L
xSBA
X
STORAGE FROM
A AND/OR B
TRANSFER STORES
DATA TO A AND/OR B
6
7
8
9
BUS
A
BUS
B
BUS
A
BUS
B
xDIR
H
L
X
xOE xCLKAB xCLKBA
L
↑
X
L
X
↑
H
↑
↑
xSAB
X
X
X
xSBA
X
X
X
xDIR
(1)
xOE xCLKAB xCLKBA
L
L
X
H or L
H
L
H or L
X
xSAB
X
H
xSBA
H
X
10
11
Note:
1. Cannot transfer data to A bus and B bus simultaneously.
12
13
14
15
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PI74LPT16646
3.3V 16-BIT REGISTERED TRANSCEIVERS
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature .............................................................. –55°C to +125°C
Ambient Temperature with Power Applied ............................. –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ....... –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ... –0.5V to +7.0V
DC Input Voltage ..................................................................... –0.5V to +7.0V
DC Output Current ............................................................................... 120 mA
Power Dissipation ..................................................................................... 1.0W
Note:
Stresses greater than those listed under 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 condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 2.7V to 3.6V)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
ODH
I
ODL
V
OH
Description
Input HIGH Voltage (Input pins)
Input HIGH Voltage (I/O pins)
Input LOW Voltage
(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
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
Min.
2.2
2.0
–0.5
Typ
(2)
—
—
—
—
—
—
—
—
—
–0.7
–60
90
—
3.0
3.0
—
—
0.2
0.3
–85
—
150
Max.
5.5
5.5
0.8
±1
±1
±1
±1
±1
±1
–1.2
–110
200
—
—
—
—
0.2
0.4
0.5
–240
±100
—
Units
V
V
V
µA
µA
µA
µA
µA
µA
V
mA
mA
V
V
V
V
V
V
mA
µA
mV
V
OL
Output LOW Voltage
I
OS
I
OFF
V
H
Short Circuit Current
(4)
Power Down Disable
Input Hysteresis
V
CC
= Max.
V
IN
= 5.5V
—
V
CC
= Max.
V
IN
= V
CC
—
V
CC
= Max.
V
IN
= GND
—
V
CC
= Max.
V
IN
= GND
—
V
CC
= Max.
V
OUT
= 5.5V
—
V
CC
= Max.
V
OUT
= GND
—
V
CC
= Min., I
IN
= –18 mA
—
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
–36
(3)
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
50
V
CC
= Min.
I
OH
= –0.1 mA Vcc-0.2
V
IN
= V
IH
or V
IL
I
OH
= –3 mA
2.4
V
CC
= 3.0V,
I
OH
= –8 mA
2.4
(5)
V
IN
= V
IH
or V
IL
I
OH
= –24 mA
2.0
V
CC
= Min.
I
OL
= 0.1 mA
—
V
IN
= V
IH
or V
IL
I
OL
= 16 mA
—
I
OL
= 24 mA
—
(3)
V
CC
= Max. , V
OUT
= GND
–60
V
CC
= 0V, V
IN
or V
OUT
≤
4.5V
—
—
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 3.3V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted 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.
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PI74LPT16646
3.3V 16-BIT REGISTERED TRANSCEIVERS
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
Quiescent Power Supply Current
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply
(4)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
Outputs Open
X
OE = GND
One Bit Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = GND
16 Bits Toggling
V
IN
= GND or V
CC
V
IN
= V
CC
– 0.6V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
2.0
50
Max.
10
30
75
Units
µA
µA
µA/
MHz
1
2
3
4
5
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
– 0.6V
V
IN
= GND
0.6
2.3
mA
V
IN
= V
CC
– 0.6V
V
IN
= GND
2.1
4.7
(5)
6
7
8
9
10
11
12
13
14
15
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 3.3V, +25°C ambient.
3. Per TTL driven input; all other inputs at Vcc 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 the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
∆I
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
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
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