74ACT16474 Datasheet, PDF (1/7 Pages) Texas Instruments – 18-BIT REGISTERED BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

54ACT16474, 74ACT16474
18ĆBIT REGISTERED BUS TRANSCEIVERS
WITH 3ĆSTATE OUTPUTS
SCAS238A − MAY 1992 − REVISED APRIL 1996
D Members of the Texas Instruments
Widebus  Family
D Inputs Are TTL-Voltage Compatible
D 3-State Outputs Drive Bus Lines Directly
D Flow-Through Architecture Optimizes
PCB Layout
D Distributed V_CC and GND Pin
Configurations Minimize High-Speed
Switching Noise
D EPIC (Enhanced-Performance Implanted
CMOS) 1-µm Process
D 500-mA Typical Latch-Up Immunity at
125°C
D Package Options Include Plastic 300-mil
Shrink Small-Outline (DL) Packages Using
25-mil Center-to-Center Pin Spacings and
380-mil Fine-Pitch Ceramic Flat (WD)
Packages Using 25-mil Center-to-Center
Pin Spacings
description
The ’ACT16474 are noninverting 18-bit registered
bus transceivers composed of two 9-bit sections
with separate control signals. For either 9-bit
transceiver section, data flow in the A-to-B mode
is controlled by output-enable (1OEAB or 2OEAB)
and clock (1CLKAB or 2CLKAB) inputs. When
1OEAB or 2OEAB is low, the corresponding
outputs are active (high or low) and take on either
the current data on low-to-high transition of
1CLKAB or 2CLKAB or the previously stored data
if 1CLKAB or 2CLKAB is low.
54ACT16474 . . . WD PACKAGE
74ACT16474 . . . DL PACKAGE
(TOP VIEW)
1OEAB 1
1CLKAB 2
1A1 3
GND 4
1A2 5
1A3 6
V_CC 7
1A4 8
1A5 9
1A6 10
GND 11
1A7 12
1A8 13
1A9 14
2A1 ¹⁵
2A2 ¹⁶
2A3 ¹⁷
GND ¹⁸
2A4 ¹⁹
2A5 ²⁰
2A6 ²¹
V_CC ²²
2A7 ²³
2A8 ²⁴
GND ²⁵
2A9 ²⁶
2CLKAB ²⁷
2OEAB ²⁸
56 1OEBA
55 1CLKBA
54 1B1
53 GND
52 1B2
51 1B3
50 V_CC
49 1B4
48 1B5
47 1B6
46 GND
45 1B7
44 1B8
43 1B9
42 _2B1
41 _2B2
40 _2B3
39 _GND
38 _2B4
37 _2B5
36 _2B6
35 _VCC
34 _2B7
33 _2B8
32 _GND
31 _2B9
30 _2CLKBA
29 _2OEBA
When 1OEAB or 2OEAB is high, the corresponding outputs are in the high-impedance state. 1OEAB or 2OEAB
does not affect the operation on the internal registers. Previously stored data can be retained or new data can
be entered while the outputs are in the high-impedance state.
Data flow from B to A is similar, but uses 1OEBA and/or 2OEBA and 1CLKBA and/or 2CLKBA.
The 74ACT16474 is packaged in TI’s shrink small-outline package, which provides twice the I/O pin count and
functionality of standard small-outline packages in the same printed-circuit-board area.
The 54ACT16474 is characterized for operation over the full military temperature range of −55°C to 125°C. The
74ACT16474 is characterized for operation from −40°C to 85°C.
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.
EPIC and Widebus are trademarks of Texas Instruments Incorporated.
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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  1996, Texas Instruments Incorporated
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