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Details, datasheet, quote on part number:SN74ALS640B
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Datasheet text preview:
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS122A DECEMBER 1983 REVISED JANUARY 1995
· · ·
Bidirectional Bus Transceivers in High-Density 20-Pin Packages Inverting Logic Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
SN54ALS640B, SN54AS640 . . . J PACKAGE SN74ALS640B, SN74AS640 . . . DW OR N PACKAGE (TOP VIEW)
description
These octal bus transceivers are designed for asynchronous two-way communication between data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending upon the level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively isolated. The -1 version of the SN74ALS640B is identical to the standard version, except that the recommended maximum IOL for the -1 version is increased to 48 mA. There is no -1 version of the SN54ALS640B. The SN54ALS640B and SN54AS640 are characterized for operation over the full military temperature range of 55°C to 125°C. The SN74ALS640B and SN74AS640 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE INPUTS OE L L H DIR L H X OPERATION B data to A bus A data to B bus Isolation
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VC C OE B1 B2 B3 B4 B5 B6 B7 B8
SN54ALS640B, SN54AS640 . . . FK PACKAGE (TOP VIEW)
A2 A1 DIR VCC
A3 A4 A5 A6 A7
4 5 6 7 8
3 2 1 20 19 18 17 16 15 14 9 10 11 12 13
OE B1 B2 B3 B4 B5
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
A8 GND B8 B7 B6
Copyright © 1995, Texas Instruments Incorporated
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SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS122A DECEMBER 1983 REVISED JANUARY 1995
logic symbol
OE DIR 19 1 G3 3 EN1 [BA] 3 EN2 [AB] 1 2 A2 A3 A4 A5 A6 A7 A8 3 4 5 6 7 8 9 17 16 15 14 13 12 11 B2 B3 B4 B5 B6 B7 B8 18 B1
logic diagram (positive logic)
OE 19
A1
2
DIR
1
A1
2
18
B1
To Seven Other Transceivers
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54ALS640B . . . . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C SN74ALS640B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54ALS640B MIN VCC VIH VIL IOH IOL Supply voltage High-level input voltage Low-level input voltage High-level output current Low-level output current output current 55 4.5 2 0.7 12 12 125 0 NOM 5 MAX 5.5 SN74ALS640B MIN 4.5 2 0.8 15 24 48§ 70 NOM 5 MAX 5.5 UNIT V V V mA mA °C
TA Operating free-air temperature § Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
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POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SDAS122A DECEMBER 1983 REVISED JANUARY 1995
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER VIK TEST CONDITIONS CONDITIONS VCC = 4.5 V, VCC = 4.5 V to 5.5 V, VCC = 4.5 V II = 18 mA IOH = 0.4 mA IOH = 3 mA IOH = 12 mA IOH = 15 mA IOL = 12 mA VOL Control inputs A or B ports Control inputs A or B ports§ Control inputs A or B ports§ VCC = 4.5 V IOL = 24 mA IOL = 48 mA VI = 7 V VI = 5.5 V VI = 2 7 V 2.7 VI = 0 4 V 0.4 VO = 2.25 V Outputs high Outputs low 20 19 27 0.1 0.1 20 20 0.1 0.1 112 50 60 30 19 27 MIN SN54ALS640B TYP MAX 1.5 VCC 2 2.4 2 2 0.25 0.4 0.25 0.35 0.35 0.4 0.5 0.5 0.1 0.1 20 20 0.1 0.1 112 45 55 mA mA µA mA mA V 3.2 VCC 2 2.4 3.2 MIN SN74ALS640B TYP MAX 1.5 UNIT V
VOH
V
II IIH IIL IO¶ ICC
VCC = 5 5 V 5.5 VCC = 5 5 V 5.5 V, VCC = 5 5 V 5.5 V, VCC = 5.5 V, VCC = 5.5 V
Outputs disabled 28 55 28 50 All typical values are at VCC = 5 V, TA = 25°C. Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V § For I/O ports, the parameters IIH and IIL include the off-state output current. ¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 , R2 = 500 , TA = MIN to MAX# SN54ALS640B MIN tPLH tPHL tPZH tPZL tPHZ tPLZ A or B or 2 B or A or A or B or A or B or 2 4 OE OE 5 2 3 MAX 14 13 25 27 12 20 SN74ALS640B MIN 2 2 4 5 2 3 MAX 11 10 21 24 10 15 ns ns ns
PARAMETER
FROM (INPUT)
TO (OUTPUT)
UNIT
# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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