ST M74HCT652 User Manual

M74HCT652

OCTAL BUS TRANSCEIVER/REGISTER

WITH 3 STATE OUTPUTS

■ HIGH SPEED:

f

= 55 MHz (TYP.) at VCC = 4.5V

MAX

■ LOW POWER DISSIPATION:

I

= 4µA(MAX.) at TA=25°C

CC

■ COMPAT I B L E WITH TTL OU TPUTS :

V

= 2V (MIN.) VIL = 0.8V (MAX)

IH

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 6mA (MIN)

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PHL

PLH

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 652

DESCRIPTION

The 74HCT652 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER AND
REGISTER (3-STATE) fabricated with silicon gate

2

C

MOS technology.
This device consists of bus transceiver circuits,
D-type flip-flops, and control circuitry arranged f or
multiplexed transmission of data directly from the
input bus or from the internal storage registers.
Enable GAB and GBA

are provided to control the
transceiver functions. Select AB(SAB) and select
BA(SBA) control pins are provided to select
whether real-time or stored data is transferred. A
low input level selects real-time da ta, and a high
selects stored data.
Data on the A or B bus, or both, can be stored i n
the internal D flip-flops by low-to-high transition at
the appropriate clock pins (CLOCK AB or CLOCK

TSSOPDIP SOP

ORDER CODES

PACKAGE TUBE T & R

DIP M74HCT652B1R

SOP M74HCT652M1R M74HCT652RM13TR

TSSOP M74HCT652TTR

BA) regardless of the select or enable control pins.
When select AB and select BA are in the real time
transfer mode, it is also possible to store data
without using the internal D type flip-flops by
simultaneously enabling GAB and GBA. In this
configuration each output reinforces its input.
Thus, when all other data sources to t he two sets
of bus lines are at high impedance, each set of
bus lines will remain at its last state.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

1/15April 2003

M74HCT652

INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION

PIN No SYMBOL NAME AND FUNCTION

1 CAB A to B Clock Input (LOW

2 SAB Select A to B Source Input
3 GAB Direction Control Input

4, 5, 6, 7, 8,

9, 10, 11

20, 19, 18,
17, 16, 15,

14, 13

21 GBA

22 SBA Select B to A Source Input
23 CBA B to A Clock Input (LOW

12 GND Ground (0V)
24 V

TRUTH TABLE

A1 to A8 A Data Inputs/Outputs

B1 to B8 B Data Inputs/Outputs

CC

to HIGH, Edge-Triggered)

Output Enable Input
(Active LOW)

to HIGH, Edge Triggered)

Positive Supply Voltage

GAB GBA CAB CBA SAB SBA A B FUNCTION

INPUTS INPUTS Both the A bus and the B bus are inputs

LH

LL

HH

X X X X Z Z The Output functions of the A and B bus are disabled

X X INPUTS INPUTS

OUTPUTS INPUTS The A bus are outputs and the B bus are inputs

X* X X L

X* X L

X* X X H Qn X

X* X H

XX*L X

X* L X

XX*HX X Qn

X* H X L L The data at the A bus are stored to the internal flip-flop
X* H X H H

LL

HH

L L The data at the B bus are displayed at the A bus. The

HH

L L The data at the B bus are stored to the internal flip-flop

HH

INPUTS OUTPUTS The A bus are inputs and the B bus are outputs.

LL

HH

L L The data at the A bus are displayed at the B bus. The

HH

Both the A and B bus are used for inputs to the internal
flip-flops. Data at the bus will be stored on low to high
transition of the clock inputs.

The data at the B bus are displayed at the A bus

data of the B bus are stored to internal flip-flop on low
to high transition of the clock pulse

The data stored to the internal flip-flop are displayed at
the A bus.

on low to high transition of the clock pulse. The states
of the internal flip-flops output directly to the A bus.

The data at the A bus are displayed at the B bus

data of the A bus are stored to the internal flip-flop on
low to high transition of the clock pulse.

The data stored to the internal flip-flops are displayed
at the B bus

on low to high transition of the clock pulse. The states
of the internal flip-flops output directly to the B bus.

2/15

M74HCT652

GAB GBA

HL

X : Don’t Care
Z : High Impedance
Qn : The data stored to the internal flip-flops by mo st recent low to hi gh transition of the clock inputs
* : The data at the A and B bus will be stored to the internal flip-flops on every low to high transition of the clock inputs.

CAB CBA SAB SBA A B FUNCTION

OUTPUTS OUTPUTS

XXHH Qn Qn

H H Qn Qn

The data stored to the internal flip-flops are displayed
at the A and B bus respectively.

The output at the A bus are displayed at the B bus, the
output at the B bus are displayed at the A bus respec­tively

LOGIC DIAGRAM

TIMING CHART

3/15

M74HCT652

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

V

I

I

OK

I

or I

I

CC

P

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit

V

V
V
T

t

r

Supply Voltage

CC

DC Input Voltage -0.5 to VCC + 0.5

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current
DC Output Current

O

DC VCC or Ground Current

GND

Power Dissipation

D

Storage Temperature

stg

Lead Temperature (10 sec)

L

°C; derate to 300mW by 10m W/°C from 65°C to 85°C

Supply Voltage

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature

op

, t

Input Rise and Fall Time (VCC = 4.5 to 5.5V)

f

-0.5 to +7 V

± 20 mA
± 20 mA
± 35 mA
± 70 mA

500(*) mW

-65 to +150 °C
300 °C

4.5 to 5.5 V

CC
CC

-55 to 125 °C
0 to 500 ns

V
V

V
V

4/15

DC SPECIFICATIONS

Test Condition Value

Symbol Parameter

V

V

V

High Level Input

IH

Voltage

V

Low Level Input

IL

Voltage

High Level Output

OH

Voltage
Low Level Output

OL

Voltage
Input Leakage

I

I

Current

I

High Impedance

OZ

Output Leakage
Current

Quiescent Supply

I

CC

Current

∆ I

Additional Worst

CC

Case Supply
Current

(*) Applicable Only to GAB, GBA, CAB, CBA, SAB, SBA Input

V

CC

(V)

4.5
to

5.5

4.5
to

5.5

4.5

4.5

5.5

5.5

5.5

IO=-20 µA

I

=-6.0 mA

O

IO=20 µA

I

=6.0 mA

O

= VCC or GND

V

I

= VIH or V

V

I

VO = VCC or GND

V

= VCC or GND

I

5.5 Per Input pin

= 0.5V or

V

I

V

= 2.4V

I

Other Inputs at

VCC or GND

I

= 0

O

= 25°C

T

A

-40 to 85°C -55 to 125°C

Min. Typ. Max. Min. Max. Min. Max.

2.0 2.0 2.0 V

0.8 0.8 0.8 V

4.4 4.5 4.4 4.4

4.18 4.31 4.13 4.10

0.0 0.1 0.1 0.1

0.17 0.26 0.33 0.40
± 0.1 ± 1 ± 1 µA

IL

± 0.5 ± 5 ± 10 µA

44080µA

2.0 2.9 3.0 mA

M74HCT652

Unit

V

V

5/15