SN74HCT573

Features:

`Operating Voltage Range of 4.5 V to 5.5 V
`High-Current 3-State Outputs Drive Bus Lines Directly or Up To 15 LSTTL Loads
`Low Power Consumption, 80-A Max ICC
`Typical tpd = 21 ns
`±6-mA Output Drive at 5 V
`Low Input Current of 1 A Max
`Inputs Are TTL-Voltage Compatible
`Bus-Structured Pinout


Specifications

Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . 0.5 V to 7 V
Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) . . . . . . . . . . . . . . . ±20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) . . . . . . . . . . . . ±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . .  ±35 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . .  . ±70 mA
Package thermal impedance, JA (see Note 2): DB package . . . . . . . . . . . . .. 70°C/W
Package thermal impedance,DW package . . . . . . . . . . . . . . . . . . . . . . . . . . .. 58°C/W
Package thermal impedance,N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  69°C/W
Package thermal impedance,NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . .  60°C/W
Package thermal impedance,PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . .  65°C to 150°C

NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.

Description

These SN74HCT573 octal transparent D-type latches feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The 'HCT573 devices are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

While the SN74HCT573 latch-enable (LE) input is high, the Q outputs respond to the data (D) inputs. When LE is low, the outputs are latched to retain the data that was set up at the D inputs.

SN74HCT573 buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components.