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SCAN1837TSSC Datasheet

  • SCAN1837TSSC

  • Transparent Latch with 3-STATE Outputs

  • 12頁

  • FAIRCHILD

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SCAN18373T Transparent Latch with 3-STATE Outputs
October 1991
Revised May 2000
SCAN18373T
Transparent Latch with 3-STATE Outputs
General Description
The SCAN18373T is a high speed, low-power transparent
latch featuring separate data inputs organized into dual 9-
bit bytes with byte-oriented latch enable and output enable
control signals. This device is compliant with IEEE 1149.1
Standard Test Access Port and Boundary Scan Architec-
ture with the incorporation of the defined boundary-scan
test logic and test access port consisting of Test Data Input
(TDI), Test Data Out (TDO), Test Mode Select (TMS), and
Test Clock (TCK).
Features
s
IEEE 1149.1 (JTAG) Compliant
s
Buffered active-low latch enable
s
3-STATE outputs for bus-oriented applications
s
9-bit data busses for parity applications
s
Reduced-swing outputs source 32 mA/sink 64 mA
s
Guaranteed to drive 50
鈩?/div>
transmission line to TTL input
levels of 0.8V and 2.0V
s
TTL compatible inputs
s
25 mil pitch SSOP (Shrink Small Outline Package)
s
Includes CLAMP and HIGHZ instructions
s
Member of Fairchild鈥檚 SCAN Products
Ordering Code:
Order Number
SCAN1837TSSC
Package Number
MS56A
Package Description
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300 Wide
Device also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Connection Diagram
Pin Descriptions
Pin Names
AI
(0鈥?)
, BI
(0鈥?)
ALE, BLE
AOE
1
, BOE
1
AO
(0鈥?)
, BO
(0鈥?)
Data Inputs
Latch Enable Inputs
3-STATE Output Enable Inputs
3-STATE Latch Outputs
Description
Truth Tables
Inputs
ALE
X
H
H
L
AOE
1
H
L
L
L
Inputs
BLE
X
H
H
L
BOE
1
H
L
L
L
BI
(0鈥?)
X
L
H
X
BO
(0鈥?)
Z
L
H
BO
0
AI
(0鈥?)
X
L
H
X
AO
(0鈥?)
Z
L
H
AO
0
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
AO
0
=
Previous AO before H-to-L transition of ALE
BO
0
=
Previous BO before H-to-L transition of BLE
漏 2000 Fairchild Semiconductor Corporation
DS010962
www.fairchildsemi.com

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