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74ABT646CMTC Datasheet

  • 74ABT646CMTC

  • Octal Transceivers and Registers with 3-STATE Outputs

  • 9頁

  • FAIRCHILD

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74ABT646 Octal Transceivers and Registers with 3-STATE Outputs
April 1992
Revised November 1999
74ABT646
Octal Transceivers and Registers with 3-STATE Outputs
General Description
The ABT646 consists of bus transceiver circuits with 3-
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 pro-
vided to control the transceiver function. In the transceiver
mode, data present at the high impedance port may be
stored in either the A or the B register or in both. The select
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 register.
Features
s
Independent registers for A and B buses
s
Multiplexed real-time and stored data
s
A and B output sink capability of 64 mA, source capabil-
ity of 32 mA
s
Guaranteed output skew
s
Guaranteed multiple output switching specifications
s
Output switching specified for both 50 pF and 250 pF
loads
s
Guaranteed simultaneous switching noise level and
dynamic threshold performance
s
Guaranteed latchup protection
s
High impedance glitch free bus loading during entire
power up and power down cycle
s
Nondestructive hot insertion capability
Ordering Code:
Order Number
74ABT646CSC
74ABT646CMSA
74ABT646CMTC
Package Number
M24B
MSA24
MTC24
Package Description
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-153, 4.4mm Wide
24-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter 鈥淴鈥?to the ordering code.
Connection Diagram
Pin Descriptions
Pin Names
A
0
鈥揂
7
B
0
鈥揃
7
CPAB, CPBA
SAB, SBA
OE
DIR
Description
Data Register A Inputs/3-STATE Outputs
Data Register B Inputs/3-STATE Outputs
Clock Pulse Inputs
Select Inputs
Output Enable Input
Direction Control Input
漏 1999 Fairchild Semiconductor Corporation
DS010978
www.fairchildsemi.com

74ABT646CMTC 產(chǎn)品屬性

  • 1,525

  • 集成電路 (IC)

  • 邏輯 - 緩沖器，驅(qū)動(dòng)器，接收器，收發(fā)器

  • 74ABT

  • 寄存收發(fā)器，非反相

  • 1

  • 8

  • 32mA，64mA

  • 4.5 V ~ 5.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 24-TSSOP（0.173"，4.40mm 寬）

  • 24-TSSOP

  • 管件

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