Datasheet

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SN54HCT623, SN74HCT623

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCLS016C – MARCH 1984 – REVISED MARCH 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Operating Voltage Range of 4.5 V to 5.5 V

Low Power Consumption, 80-µA Max I

Typical t

= 11 ns

±6-mA Output Drive at 5 V

Low Input Current of 1 µA Max

Inputs Are TTL-Voltage Compatible

Lock Bus-Latch Capability

True Logic

High-Current 3-State Outputs Can Drive Up

To 15 LSTTL Loads

SN54HCT623 ...J OR W PACKAGE

SN74HCT623 . . . DW OR N PACKAGE

(TOP VIEW)

SN54HCT623 . . . FK PACKAGE

(TOP VIEW)

OEAB

GND

OEBA

3212019

910111213

OEAB

OEBA

GND

description/ordering information

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The

control-function implementation allows for maximum flexibility in timing.

The ’HCT623 devices allow data transmission from the A bus to the B bus or from the B bus to the A bus,

depending upon the logic levels at the output-enable (OEAB and OEBA) inputs.

The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable

configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and OEBA

Each output reinforces its input in this transceiver configuration. When both OEAB and OEBA

are enabled and

all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total)

remain at their last states. The 8-bit codes appearing on the two sets of buses are identical.

To ensure the high-impedance state during power up or power down, OEBA

should be tied to V

through a

pullup resistor and OEAB should be tied to GND through a pulldown resistor; the minimum value of the resistor

is determined by the current-sinking/current-sourcing capability of the driver.

ORDERING INFORMATION

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

40°Cto85°C

PDIP – N Tube SN74HCT623N SN74HCT623N

–

40°C

85°C

SOIC – DW Tube SN74HCT623DW HCT623

CDIP – J Tube SNJ54HCT623J SNJ54HCT623J

–55°C to 125°C

CFP – W Tube SNJ54HCT623W SNJ54HCT623W

LCCC – FK Tube SNJ54HCT623FK SNJ54HCT623FK

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information current as of publication date. Products conform to

specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all

parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Summary of content (10 pages)

PAGE 1
SN54HCT623, SN74HCT623 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS016C – MARCH 1984 – REVISED MARCH 2003 Operating Voltage Range of 4.5 V to 5.
PAGE 2
SN54HCT623, SN74HCT623 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS016C – MARCH 1984 – REVISED MARCH 2003 FUNCTION TABLE INPUTS OEBA OEAB OPERATION L L B data to A bus H H A data to B bus H L Isolation H B data to A bus, A data to B bus L logic diagram (positive logic) OEBA OEAB A1 19 1 2 18 B1 To Seven Other Transceivers absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . .
PAGE 3
SN54HCT623, SN74HCT623 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS016C – MARCH 1984 – REVISED MARCH 2003 recommended operating conditions (see Note 3) SN54HCT623 NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 VCC VIH Supply voltage VIL VI Low-level input voltage Input voltage 0 VO tt Output voltage 0 High-level input voltage VCC = 4.5 V to 5.5 V VCC = 4.5 V to 5.5 V SN74HCT623 MIN 2 2 Input transition (rise and fall) time V V 0.8 VCC VCC UNIT 0 0 500 0.
PAGE 4
SN54HCT623, SN74HCT623 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS016C – MARCH 1984 – REVISED MARCH 2003 switching characteristics over recommended operating free-air temperature range, CL = 150 pF (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tpd d A or B B or A OEBA A ten OEAB B tt A or B VCC MIN TA = 25°C TYP MAX SN54HCT623 MIN MAX SN74HCT623 MIN MAX 4.5 V 18 38 58 47 5.5 V 11 34 52 42 4.5 V 36 59 89 74 5.5 V 30 53 80 67 4.
PAGE 5
SN54HCT623, SN74HCT623 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCLS016C – MARCH 1984 – REVISED MARCH 2003 PARAMETER MEASUREMENT INFORMATION VCC From Output Under Test CL (see Note A) PARAMETER S1 Test Point tPZH ten RL S2 1 kΩ tPZL tPHZ tdis S2 50 pF or 150 pF Open Closed Closed Open 1 kΩ –– LOAD CIRCUIT 2.7 V S1 50 pF tPLZ tpd or tt Input 1.3 V 0.3 V CL RL 2.7 V 50 pF or 150 pF Open Closed Closed Open Open Open 3V 1.3 V 0.
PAGE 6
PACKAGE OPTION ADDENDUM www.ti.
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