54abt646 National Semiconductor Corporation, 54abt646 Datasheet

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54abt646

Manufacturer Part Number
54abt646
Description
Octal Transceivers And Registers With Tri-state Outputs
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1998 National Semiconductor Corporation
54ABT646
Octal Transceivers and Registers with TRI-STATE
Outputs
General Description
The ’ABT646 consists of bus transceiver circuits with
TRI-STATE, 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 will
be clocked into the registers as the appropriate clock pin
goes to a high logic level. Control OE and direction pins are
provided to control the transceiver function. In the trans-
ceiver mode, data present at the high impedance port may
be stored in either the A or the B register or in both. The se-
lect controls can multiplex stored and real-time (transparent
mode) data. The direction control determines which bus will
receive data when the enable control OE is Active LOW. In
the isolation mode (control OE HIGH), A data may be stored
in the B register and/or B data may be stored in the A regis-
ter.
Ordering Code
TRI-STATE
54ABT646J-QML
54ABT646W-QML
54ABT646E-QML
®
is a registered trademark of National Semiconductor Corporation.
Military
DS100209
Package Number
W24C
E28A
J24A
24-Lead Ceramic Dual-In-Line
24-Lead Cerpack
28-Lead Ceramic Leadless Chip Carrier, Type C
Features
n Independent registers for A and B buses
n Multiplexed real-time and stored data
n A and B output sink capability of 48 mA, source
n Guaranteed multiple output switching specifications
n Output switching specified for both 50 pF and 250 pF
n Guaranteed simultaneous switching noise level and
n Guaranteed latchup protection
n High impedance glitch free bus loading during entire
n Nondestructive hot insertion capability
n Standard Microcircuit Drawing (SMD) 5962-9457701
capability of 24 mA
loads
dynamic threshold performance
power up and power down cycle
Package Description
®
www.national.com
July 1998

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54abt646 Summary of contents

Page 1

... B register and/or B data may be stored in the A regis- ter. Ordering Code Military Package Number 54ABT646J-QML J24A 54ABT646W-QML W24C 54ABT646E-QML E28A TRI-STATE ® registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100209 Features n Independent registers for A and B buses n Multiplexed real-time and stored data ...

Page 2

Connection Diagrams Pin Assignment for DIP and Flatpak DS100209-3 Pin Descriptions www.national.com Pin Assignment for LCC Pin Description Names A –A Data Register A Inputs TRI-STATE Outputs B –B Data Register B Inputs TRI-STATE Outputs CPAB, ...

Page 3

Connection Diagrams (Continued) Real Time Transfer A-Bus to B-Bus DS100209-5 FIGURE 1. Real Time Transfer B-Bus to A-Bus DS100209-6 FIGURE 2. Inputs OE DIR CPAB CPBA SAB SBA ...

Page 4

Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com DS100209-9 4 ...

Page 5

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias Ceramic V Pin Potential to Ground Pin CC Input ...

Page 6

DC Electrical Characteristics < Note 4: For 8-bit toggling, I 1.4 mA/MHz. CCD Note 5: Guaranteed but not tested. AC Electrical Characteristics Symbol Parameter f Max Clock Frequency max t Propagation Delay PLH t Clock to Bus PHL t Propagation ...

Page 7

Capacitance (Continued Temperature (T ) PLH pF, 1 Output Switching C L Clock to Bus t vs Load Capacitance PLH = 25˚C 1 Output Switching Clock to Bus t vs Load Capacitance PLH ...

Page 8

Capacitance (Continued Temperature (T ) PZL pF, 1 Output Switching Bus t vs Temperature (T ) PZH pF, 1 Output Switching Temperature (T ) ...

Page 9

Capacitance (Continued Temperature (T ) PZL pF, 8 Outputs Switching Bus t vs Load Capacitance PZL = 25˚C 8 Outputs Switching Bus t and t vs Number ...

Page 10

Capacitance (Continued Frequency, Average 25˚ 5. All Outputs Unloaded/Unterminated; All Outputs Switching in phase 50% Duty Cycle @ t LOW vs Temperature (T ) SET pF, 1 Output ...

Page 11

AC Loading DS100209-10 Includes jig and probe capacitance * FIGURE 5. Standard AC Test Load FIGURE 6. Test Input Signal Levels Input Pulse Requirements Amplitude Rep. Rate 3.0V 1 MHz 500 ns 2.5 ns FIGURE 7. Test ...

Page 12

12 ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted 28-Lead Ceramic Leadless Chip Carrier (L) 24-Lead Ceramic Dual-in-Line Package (D) NS Package Number E28A NS Package Number J24A 13 www.national.com ...

Page 14

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR ...

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