SGS Thomson Microelectronics 74AC373 Datasheet

74AC373

OCTAL D-TYPE LATCH

WITH 3 STATE OUTPUT NON INVERTING

■ HIGH SPEED: t

■ LOWPOWERDISSIPATION:

=8µA (MAX.)at TA=25oC

I

CC

■ HIGH NOISE IMMUNITY:

V

NIH=VNIL

■ 50Ω TRANSMISSION LINE DRIVING

=5 ns (TYP.)atVCC=5V

PD

=28%VCC(MIN.)

CAPABILITY

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

|=IOL=24mA(MIN)

OH

■ BALANCE DPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■ OPERATINGVOLTAGERAN GE:

V

(OPR) = 2V to 6V

CC

■ PIN AND FUNCTION COMPATIBLE WITH

74SERIES373

■ IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The AC373 is an advanced high-speed CMOS
OCTAL D-TYPE LATCH with 3 STATE OUTPUT
NON INVERTING fabricated with sub-micron
silicon gate and double-layermetal wiring C

2

MOS
technology. It is ideal for low power applications
mantaining high speed operation similar to
equivalentBipolarSchottkyTTL.

These 8 bit D-Type latch are controlledby a latch
enable input (LE) and an output enable input

B

(Plastic Package)

(Micro Package)

M

ORDERCODES:

74AC373B 74AC373M

(OE).
While the LE inputs is held at a high level, the Q

outputs will follow the data input precisely or
inversely. When the LE is taken low, the Q
outputs will be latched precisely or inversely at
the logic level of D input data. While the (OE)
input is low, the 8 outputs will be in a normallogic
state (high or low logic level) and while high level
the outputs will be in a high impedance state.

This device is designed to interface directly High
Speed CMOS systems with TTL and NMOS
components.

All inputs and outputs are equipped with
protectioncircuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.

PINCONNECTION AND IEC LOGIC SYMBOLS

April 1997

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74AC373

INPUTAND OUTPUTEQUIVALENTCIRCUIT PIN DESCRIPTION

PI N No SYM B O L NAME AN D FUNC T I ON

1 OE 3 State Output Enable

2, 5, 6,

9, 12, 15,

16, 19

3, 4, 7,

8, 13, 14,

17, 18

11 LE Latch Enable

10 GND Ground (0V)
20 V

TRUTH TABLE

INPUTS OUTPUTS

OE LE D Q

HXXZ
L L X NO CHANGE
LHLL
LHHH

X:DON’T CARE
Z:HIGHIMPEDANCE
*:Q OUTPUTS ARELATCHED AT THE TIMEWHENTHEINPUT IS TAKEN LO W LOG ICLEVEL.

Q0 to Q7 Data Inputs

D0 to D7 3 State Outputs

CC

Input (Active LOW)

Input

Positive Supply Voltage

LOGICDIAGRAMS

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74AC373

ABSOLUTE MAXIMUM RATINGS

Symb o l Parameter Val u e Uni t

V

V

V

I

I

OK

I

orI

I

CC

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

RECOMMENDEDOPERATINGCONDITIONS

Symb o l Parameter Value Un i t

V

V

V

T

dt/dv Input Rise and Fall Time V

1) VINfrom30%to 70%of V

Supply Voltage -0.5 to +7 V

CC

DC Input Voltage -0.5 to VCC+ 0.5 V

I

DC Output Voltage -0.5 to VCC+ 0.5 V

O

DC Input Diode Current ± 20 mA

IK

DC Output Diode Current ± 20 mA
DC Output Current ± 50 mA

O

DC VCCor Ground Current ± 400 mA

GND

Storage Temperature -65 to +150

stg

Lead Temperature (10 sec) 300

L

Supply Voltage 2 to 6 V

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature: -40 to +85

op

= 3.0, 4.5 or 5.5 V(note 1) 8 ns/V

CC

CC

CC
CC

o

C

o

C

V
V

o

C

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