HD74LS373P datasheet
HD74LS373
Octal D-type Transparent Latches (with three-state outputs)
REJ03D0482–0200
Rev.2.00
Feb.18.2005 The HD74LS373, 8-bit register features totem-pole three-state outputs designed specifically for driving highly-capacitive or relatively low-impedance loads. The high-impedance third state and increased high-logic-level drive provide this register with the capacity of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
The eight latches are transparent D-type latches meaning that while the enable (G) is high the Q outputs will follow the data (D) inputs. When the enable is taken low the output will be latched at the level of the data that was setup. Features
? Ordering Information
Part Name Package Type Package Code
(Previous Code)
Package
Abbreviation
Taping Abbreviation
(Quantity)
HD74LS373P DILP-20
pin PRDP0020AC-B
(DP-20NEV)
P —
HD74LS373FPEL SOP-20 pin (JEITA) PRSP0020DD-B
(FP-20DAV)
FP EL (2,000 pcs/reel)
HD74LS373RPEL SOP-20 pin (JEDEC) PRSP0020DC-A
(FP-20DBV)
RP EL (1,000 pcs/reel)
Note: Please consult the sales office for the above package availability. Pin Arrangement
Function Table
Inputs Output
Output control Enable G D Q
L H H H L H L L L L X Q 0
H X X Z Notes: H; high level, L; low level, X; irrelevant
Q 0; level of Q before the indicated steady-state input conditions were established Z; off (high-impedance) state of a three-state output
Block Diagram
Absolute Maximum Ratings
Item Symbol Ratings Unit
Supply voltage V CC 7 V
Input voltage V IN 7 V Power dissipation P T 400 mW
Storage temperature
Tstg
–65 to +150
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage V CC 4.75 5.00 5.25 V Output voltage V OH — — 5.5 V I OH — — –2.6 mA Output current
I OL — — 24 mA
Operating temperature Topr –20 25 75 °C “H” Level 15
—
—
ns
Enable pulse width “L” Level
t w 15 — — ns Data setup time t su
5↓ — — ns
Data hold time t h 20↓ — — ns
Electrical Characteristics
(Ta = –20 to +75 °C)
Item Symbol min. typ.* max. Unit Condition
V IH 2.0 — — V
— — 0.7 Data inputs
Input voltage V IL
— — 0.8 V G, Output control inputs
V OH 2.4 — — V
V CC = 4.75 V, V IH = 2 V, V IL = V IL max
I OH = –2.6 mA
— — 0.4 I OL = 12 mA Output voltage
V OL — — 0.5 V
I OL = 24 mA
V CC = 4.75 V,
V IH = 2 V, V IL = V IL max I OZH — — 20 V O = 2.7 V Output current
I OZL — — –20 μA
V O = 0.4 V
V CC = 5.25 V,
V IH = 2 V I IH — — 20 μA V CC = 5.25 V, V I = 2.7 V I IL — — –0.4 mA V CC = 5.25 V, V I = 0.4 V
Input current
I I —
— 0.1 mA V CC = 5.25 V, V I = 7 V Short-circuit output current I OS –30 — –130 mA V CC = 5.25 V Supply current
I CC — 24 40 mA
V CC = 5.25 V, V I = 4.5 V (Output control)
Input clamp voltage
V IK — — –1.5 V V CC = 4.75 V, I IN = –18 mA
Note: * V CC = 5 V, Ta = 25°C
Switching Characteristics
(V CC = 5 V, Ta = 25°C)
Item Symbol Input Output min. typ. max. Unit Condition
t PLH — 12 18
t PHL D Q
— 12 18
t PLH — 20 30 Propagation delay time
t PHL G Q
— 18 30
t ZH — 15 28
Output enable time t ZL OC Q
— 25 36 C L = 45 pF,
R L = 667 ? t HZ — 12 20 Output disable time
t LZ OC Q — 15 25 ns
C L = 5 pF,
R L = 667 ?
Testing Method Test Circuit
Waveforms 1
Waveforms 2
Waveforms 3
Package Dimensions
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