IDT74FCT621T(2006) 查看數據表（PDF） - Integrated Device Technology

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IDT74FCT621T
(Rev.:2006)

FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)

Integrated Device Technology 

IDT74FCT621T/AT

FAST CMOS OCTAL BUS TRANSCEIVER (OPEN DRAIN)

PIN CONFIGURATION

GAB 1

A1 2

A2 3

A3 4

A4 5

A5 6

A6 7

A7 8

A8 9

GND 10

20

VCC

19 GBA

18

B1

17

B2

16

B3

15

B4

14

B5

13

B6

12

B7

11

B8

SOIC

TOP VIEW

INDUSTRIAL TEMPERATURE RANGE

ABSOLUTE MAXIMUM RATINGS(1)

Symbol

Description

Max

Unit

VTERM(2) Terminal Voltage with Respect to GND

–0.5 to +7

V

VTERM(3) Terminal Voltage with Respect to GND –0.5 to VCC+0.5 V

TSTG Storage Temperature

–65 to +150

°C

IOUT DC Output Current

–60 to +120 mA

NOTES:

1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause

permanent damage to the device. This is a stress rating only and functional operation

of the device at these or any other conditions above those indicated in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect reliability. No terminal voltage may exceed

Vcc by +0.5V unless otherwise noted.

2. Inputs and Vcc terminals only.

3. Output and I/O terminals only.

CAPACITANCE (TA = +25°C, F = 1.0MHz)

Symbol

Parameter(1)

Conditions Typ. Max. Unit

CIN

Input Capacitance

VIN = 0V

6

10 pF

COUT

Output Capacitance VOUT = 0V

8

12 pF

NOTE:

1. This parameter is measured at characterization but not tested.

PIN DESCRIPTION

Pin Names

Description

GBA, GAB

Enable Inputs

A1 – A8

A Inputs or Open-drain Outputs

B1 – B8

B Inputs or Open-drain Outputs

FUNCTION TABLE(1)

Enable Inputs

GBA

GAB

Function

L

L

B data to A bus

H

H

A data to B bus

H

L

OFF

L

H

B data to A bus

A data to B bus

NOTE:

1. H = HIGH Voltage Level.

L = LOW Voltage Level.

OFF = HIGH if pull-up resistor is connected to Open-Drain output.

2

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