74ACT11544 Datasheet, PDF (1/8 Pages) Texas Instruments – OCTAL REGISTERED TRANSCEIVER WITH 3-STATE OUTPUTS

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74ACT11544
OCTAL REGISTERED TRANSCEIVER
WITH 3ĆSTATE OUTPUTS
SCAS133 − D3609, JULY 1990 − REVISED APRIL 1993
• Inputs Are TTL-Voltage Compatible
• 3-State Inverted Outputs
• Back-to-Back Registers for Storage
• Flow-Through Architecture Optimizes
PCB Layout
• Center-Pin V_CC and GND Configurations
Minimize High-Speed Switching Noise
• EPICt (Enhanced-Performance Implanted
CMOS) 1-mm Process
• 500-mA Typical Latch-Up Immunity
at 125°C
description
This 8-bit registered transceiver contains two sets
of D-type latches for temporary storage of data
flowing in either direction. Separate latch enable
(LEAB or LEBA) and output enable (GAB or GBA)
inputs are provided for each register to permit
independent control in either direction of data flow.
The 74ACT11544 inverts data in both directions.
DW PACKAGE
(TOP VIEW)
CEBA 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
CEAB ¹⁴
28 GBA
27 LEBA
26 _B1
25 _B2
24 _B3
23 _B4
22 _VCC
21 _VCC
20 _B5
19 _B6
18 _B7
17 _B8
16 _LEAB
15 _GAB
The A-to-B enable (CEAB) input must be low in order to enter data from A or to output data to B. Having CEAB
low and LEAB low makes the A-to-B latches transparent; a subsequent low-to-high transition of LEAB puts the
A latches in the storage mode. With CEAB and GAB both low, the 3-state B outputs are active and reflect the
data present at the output of the A latches. Data flow from B-to-A is similar, but requires the use of CEBA, LEBA,
and GBA inputs.
The 74ACT11544 is characterized for operation from − 40°C to 85°C.
FUNCTION TABLE
INPUTS
CEAB LEAB
H
X
GAB
X
LATCH
STATUS
A TO B†
Storing
OUTPUT BUFFERS
B1 THRU B8
Z
X
H
Storing
X
H
Z
L
L
L
Transparent
Current A Data
L
H
L
Storing
Previous^} A Data
† _{A-to-B data flow is shown: B-to-A flow control is the same except uses}
CEBA, LEBA, and GBA.
‡ _{Data present before low-to-high transition of LEAB.}
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  1993, Texas Instruments Incorporated
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