74AC11646_09 Datasheet, PDF (1/9 Pages) Texas Instruments – OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS

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• Independent Registers for A and B Buses
• Multiplexed Real-Time and Stored Data
• Flow-Through Architecture Optimizes
PCB Layout
• Center-Pin V_CC and GND Configurations
Minimize High-Speed Switching Noise
• EPIC (Enhanced-Performance Implanted
CMOS) 1-µm Process
• 500-mA Typical Latch-Up Immunity
at 125°C
description
The 74AC11646 consists 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 74AC11646.
74AC11646
OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3ĆSTATE OUTPUTS
SCAS079A − JULY 1987 − REVISED APRIL 1993
DW PACKAGE
(TOP VIEW)
OE 1
A1 2
A2 3
A3 4
A4 5
GND 6
GND 7
GND 8
GND 9
A5 10
A6 11
A7 12
A8 13
DIR 14
28 CLKAB
27 SAB
26 B1
25 B2
24 B3
23 B4
22 V_CC
21 V_CC
20 B5
19 B6
18 B7
17 B8
16 CLKBA
15 SBA
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 may 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 will receive data when OE is low. In the isolation mode (OE high),
A data may be stored in one register and/or B data may be stored in the other register.
When an output function is disabled, the input function is still enabled and may be used to store and transmit
data. Only one of the two buses, A or B, may be driven at a time.
The 74AC11646 is characterized for operation from − 40°C to 85°C.
EPIC is a trademark of Texas Instruments Incorporated.
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.
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Copyright  1993, Texas Instruments Incorporated
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