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Fairchild Semiconductor Electronic Components Datasheet

74VHC373 Datasheet

Octal D-Type Latch with 3-STATE Outputs

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February 1993
Revised April 1999
74VHC373
Octal D-Type Latch with 3-STATE Outputs
General Description
The VHC373 is an advanced high speed CMOS octal D-
type latch with 3-STATE output fabricated with silicon gate
CMOS technology. It achieves the high speed operation
similar to equivalent Bipolar Schottky TTL while maintain-
ing the CMOS low power dissipation. This 8-bit D-type
latch is controlled by a latch enable input (LE) and an out-
put enable input (OE). The latches appear transparent to
data when latch enable (LE) is HIGH. When LE is LOW, the
data that meets the setup time is LATCHED. When the OE
input is HIGH, the eight outputs are in a high impedance
state.
An input protection circuit ensures that 0V to 7V can be
applied to the input pins without regard to the supply volt-
age. This device can be used to interface 5V to 3V systems
and two supply systems such as battery back up. This cir-
cuit prevents device destruction due to mismatched supply
and input voltages.
Features
s High Speed: tPD = 5.0 ns (typ) @ VCC = 5V
s High Noise Immunity: VNIH = VNIL = 28% VCC (Min)
s Power Down Protection is provided on all inputs
s Low Noise: VOLP = 0.6V (typ)
s Low Power Dissipation: ICC = 4 µA (Max) @ TA = 25°C
s Pin and Function Compatible with 74HC373
Ordering Code:
Order Number Package Number
Package Description
74VHC373M
74VHC373SJ
74VHC373MTC
M20B
M20D
MTC20
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74VHC373N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
D0–D7
LE
OE
O0–O7
Description
Data Inputs
Latch Enable Input
Output Enable Input
3-STATE Outputs
© 1999 Fairchild Semiconductor Corporation DS011555.prf
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

74VHC373 Datasheet

Octal D-Type Latch with 3-STATE Outputs

No Preview Available !

Functional Description
The VHC373 contains eight D-type latches with 3-STATE
standard outputs. When the Latch Enable (LE) input is
HIGH, data on the Dn inputs enters the latches. In this con-
dition the latches are transparent, i.e., a latch output will
change state each time its D input changes. When LE is
LOW, the latches store the information that was present on
the D inputs a setup time preceding the HIGH-to-LOW tran-
sition of LE. The 3-STATE standard outputs are controlled
by the Output Enable (OE) input. When OE is LOW, the
standard outputs are in the 2-state mode. When OE is
HIGH, the standard outputs are in the high impedance
mode but this does not interfere with entering new data into
the latches.
Truth Table
Inputs
Outputs
LE OE Dn
XHX
On
Z
HL L
L
HLH
H
LLX
O0
H = HIGH Voltage Level
L = LOW Voltage Level
Z = High Impedance
X = Immaterial
O0 = Previous O0 before HIGH-to-LOW transition of Latch Enable
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.fairchildsemi.com
2


Part Number 74VHC373
Description Octal D-Type Latch with 3-STATE Outputs
Maker Fairchild Semiconductor
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74VHC373 Datasheet PDF






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