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SN54ABT646A, SN74ABT646A

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3 STATE OUTPUTS

SCBS069H − JULY 1991 − REVISED MAY 2004

Typical V

OLP

(Output Ground Bounce)

<1 V at V

= 5 V, T

= 25°C

High-Drive Outputs (−32-mA I

, 64-mA I

)

off

Supports Partial-Power-Down Mode

Operation

Latch-Up Performance Exceeds 500 mA Per

JEDEC Standard JESD-17

ESD Protection Exceeds JESD 22

− 2000-V Human-Body Model (A114-A)

− 200-V Machine Model (A115-A)

SN54ABT646A . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

description/ordering information

These devices consist of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed

transmission of data directly from the input bus or from the internal registers. Data on the A or B bus is clocked

into the registers on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input. Figure 1

illustrates the four fundamental bus-management functions that can be performed with the ’ABT646A devices.

ORDERING INFORMATION

PDIP − NT

SOIC − DW

SOP − NS

−40°C to 85°C

SSOP − DB

TSSOP − PW

TVSOP − DGV

CDIP − JT

−55 C 125°C

−55°C to 125 C

CFP − W

LCCC − FK

PACKAGE†

Tube

Tape and reel

Tube

Tape and reel

Tube

ORDERABLE

PART NUMBER

SN74ABT646ANT

SN74ABT646ADW

SN74ABT646ADWR

SN74ABT646ANSR

SN74ABT646ADBR

SN74ABT646APW

SN74ABT646APWR

SN74ABT646ADGVR

SNJ54ABT646AJT

SNJ54ABT646AW

SNJ54ABT646AFK

AB646A

SNJ54ABT646AJT

SNJ54ABT646AW

SNJ54ABT646AFK

ABT646A

AB646A

TOP-SIDE

MARKING

SN74ABT646ANT

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303

•

DALLAS, TEXAS 75265

GND

On products compliant to MIL PRF 38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

CLKAB

SAB

DIR

GND

CLKBA

SBA

DIR

SAB

CLKAB

CLKBA

SBA

2 1 28 27 26

1112 13 14 15 16 17 18

SN54ABT646A . . . JT OR W PACKAGE

SN74ABT646A . . . DB, DGV, DW, NS, NT, OR PW PACKAGE

(TOP VIEW)



2004, Texas Instruments Incorporated

SCBS069H − JULY 1991 − REVISED MAY 2004

SN54ABT646A, SN74ABT646A

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3 STATE OUTPUTS

description/ordering information(continued)

Output-enable (OE) and direction-control (DIR) inputs are provided to control the transceiver functions. In the

transceiver mode, data present at the high-impedance port can be stored in either register or in both.

The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. The

direction control (DIR) determines which bus receives data when OE is low. In the isolation mode (OE high),

A data can be stored in one register and/or B data can be stored in the other register.

When an output function is disabled, the input function still is enabled and can be used to store and transmit

data. Only one of the two buses, A or B, can be driven at a time.

These devices are fully specified for partial-power-down applications using I

off

. The I

off

circuitry disables the

outputs, preventing damaging current backflow through the devices when they are powered down.

To ensure the high-impedance state during power up or power down, OE should be tied to V

through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

POST OFFICE BOX 655303

•

DALLAS, TEXAS 75265

SN54ABT646A, SN74ABT646A

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3 STATE OUTPUTS

SCBS069H − JULY 1991 − REVISED MAY 2004

BUS B

DIR

CLKAB CLKBA

SAB

SBA

DIR

CLKAB

CLKBA

SAB

BUS B

SBA

REAL-TIME TRANSFER

BUS A TO BUS B

CLKAB

H or L

CLKBA

H or L

SAB

BUS B

SBA

TRANSFER STORED DATA

TO A AND/OR B

BUS A

REAL-TIME TRANSFER

BUS B TO BUS A

BUS B

BUS A

DIR

CLKAB CLKBA

↑

STORAGE FROM

A, B, OR A AND B

SAB

SBA

Pin numbers shown are for the DB, DGV, DW, JT, NS, NT, PW, and W packages.

Figure 1. Bus-Management Functions

POST OFFICE BOX 655303

•

DALLAS, TEXAS 75265

BUS A

DIR

BUS A

SCBS069H − JULY 1991 − REVISED MAY 2004

SN54ABT646A, SN74ABT646A

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3 STATE OUTPUTS

FUNCTION TABLE

INPUTS

DIR

CLKAB

↑

H or L

CLKBA

↑

H or L

SAB

SBA

A1−A8

Input

Unspecified†

Input

Input disabled

Output

Input

DATA I/Os

B1−B8

Unspecified†

Input

Input disabled

Input

Output

OPERATION OR FUNCTION

Store A, B unspecified†

Store B, A unspecified†

Store A and B data

Isolation, hold storage

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

† The data-output functions can be enabled or disabled by various signals at OE and DIR. Data-input functions always are enabled, i.e., data at

the bus terminals is stored on every low-to-high transition of the clock inputs.

logic diagram (positive logic)

DIR

CLKBA

SBA

CLKAB

SAB

One of Eight

Channels

To Seven Other Channels

Pin numbers shown are for the DB, DGV, DW, JT, NS, NT, PW, and W packages.

POST OFFICE BOX 655303

•

DALLAS, TEXAS 75265

参数对比

与SN74ABT646ADGVR相近的元器件有：5962-9457702Q3A、SNJ54ABT646AJT、5962-9457702QLA、SN74ABT646ADW、SN74ABT646ADWR、SN74ABT646ADBR、SN74ABT646APW、SN74ABT646ANT、SN74ABT646ADBLE。描述及对比如下：

型号	SN74ABT646ADGVR	5962-9457702Q3A	SNJ54ABT646AJT	5962-9457702QLA	SN74ABT646ADW	SN74ABT646ADWR	SN74ABT646ADBR	SN74ABT646APW	SN74ABT646ANT	SN74ABT646ADBLE
描述	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, TVSOP-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CQCC28, CERAMIC, LCC-28	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDIP24, CERAMIC, DIP-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDIP24, CERAMIC, DIP-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SSOP-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, TSSOP-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP24, ROHS COMPLIANT, PLASTIC, DIP-24	ABT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, PLASTIC, SSOP-24
是否Rohs认证	符合	不符合	不符合	不符合	符合	符合	符合	符合	符合	不符合
零件包装代码	SOIC	QLCC	DIP	DIP	SOIC	SOIC	SSOP	TSSOP	DIP	SSOP
包装说明	GREEN, PLASTIC, TVSOP-24	HQCCN,	DIP,	DIP,	GREEN, PLASTIC, SOIC-24	GREEN, PLASTIC, SOIC-24	GREEN, PLASTIC, SSOP-24	GREEN, PLASTIC, TSSOP-24	ROHS COMPLIANT, PLASTIC, DIP-24	PLASTIC, SSOP-24
针数	24	28	24	24	24	24	24	24	24	24
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown	unknown	unknown	unknown	unknown	unknown
系列	ABT	ABT	ABT	ABT	ABT	ABT	ABT	ABT	ABT	ABT
JESD-30 代码	R-PDSO-G24	S-CQCC-N28	R-GDIP-T24	R-GDIP-T24	R-PDSO-G24	R-PDSO-G24	R-PDSO-G24	R-PDSO-G24	R-PDIP-T24	R-PDSO-G24
长度	5 mm	11.43 mm	32.005 mm	32.005 mm	15.4 mm	15.4 mm	8.2 mm	7.8 mm	31.64 mm	8.2 mm
逻辑集成电路类型	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER	REGISTERED BUS TRANSCEIVER
湿度敏感等级	1	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	1	1	1	1	NOT APPLICABLE	NOT SPECIFIED
位数	8	8	8	8	8	8	8	8	8	8
功能数量	1	1	1	1	1	1	1	1	1	1
端口数量	2	2	2	2	2	2	2	2	2	2
端子数量	24	28	24	24	24	24	24	24	24	24
最高工作温度	85 °C	125 °C	125 °C	125 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
最低工作温度	-40 °C	-55 °C	-55 °C	-55 °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	3-STATE
输出极性	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE	TRUE
封装主体材料	PLASTIC/EPOXY	CERAMIC, METAL-SEALED COFIRED	CERAMIC, GLASS-SEALED	CERAMIC, GLASS-SEALED	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	TSSOP	HQCCN	DIP	DIP	SOP	SOP	SSOP	TSSOP	DIP	SSOP
封装形状	RECTANGULAR	SQUARE	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
封装形式	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	CHIP CARRIER, HEAT SINK/SLUG	IN-LINE	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	IN-LINE	SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）	260	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	260	260	260	260	NOT SPECIFIED	NOT SPECIFIED
传播延迟（tpd）	5.6 ns	6.7 ns	6.7 ns	6.7 ns	5.6 ns	5.6 ns	5.6 ns	5.6 ns	5.6 ns	5.6 ns
座面最大高度	1.2 mm	2.03 mm	5.08 mm	5.08 mm	2.65 mm	2.65 mm	2 mm	1.2 mm	5.08 mm	2 mm
最大供电电压 (Vsup)	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V	5.5 V
最小供电电压 (Vsup)	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V	4.5 V
标称供电电压 (Vsup)	5 V	5 V	5 V	5 V	5 V	5 V	5 V	5 V	5 V	5 V
表面贴装	YES	YES	NO	NO	YES	YES	YES	YES	NO	YES
技术	BICMOS	BICMOS	BICMOS	BICMOS	BICMOS	BICMOS	BICMOS	BICMOS	BICMOS	BICMOS
温度等级	INDUSTRIAL	MILITARY	MILITARY	MILITARY	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
端子面层	NICKEL PALLADIUM GOLD	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NICKEL PALLADIUM GOLD	NICKEL PALLADIUM GOLD	NICKEL PALLADIUM GOLD	NICKEL PALLADIUM GOLD	NICKEL PALLADIUM GOLD	TIN LEAD
端子形式	GULL WING	NO LEAD	THROUGH-HOLE	THROUGH-HOLE	GULL WING	GULL WING	GULL WING	GULL WING	THROUGH-HOLE	GULL WING
端子节距	0.4 mm	1.27 mm	2.54 mm	2.54 mm	1.27 mm	1.27 mm	0.65 mm	0.65 mm	2.54 mm	0.65 mm
端子位置	DUAL	QUAD	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
处于峰值回流温度下的最长时间	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
宽度	4.4 mm	11.43 mm	10.16 mm	10.16 mm	7.5 mm	7.5 mm	5.3 mm	4.4 mm	10.16 mm	5.3 mm
是否无铅	不含铅	含铅	含铅	含铅	不含铅	不含铅	含铅	不含铅	不含铅	-
厂商名称	Rochester Electronics	-	Rochester Electronics	-	Rochester Electronics	Rochester Electronics	Rochester Electronics	Rochester Electronics	Rochester Electronics	Rochester Electronics
Is Samacsys	N	-	-	-	N	N	N	N	N	-
JESD-609代码	e4	-	-	-	e4	e4	e4	e4	e4	e0
Base Number Matches	1	1	1	1	1	1	1	1	1	-