Datasheet HD74HC648, HD74HC646 Datasheet (HIT)

HD74HC646/HD74HC648

Octal Bus Transceivers/Registers with Multiplexed 3-state outputs

Description

Six control inputs enable this device to be used as a latched transceiver, unlatched transceiver or a
combination of both. As a latched transceiver, data from one bus is stored for later retrieval by the other
bus. Alternately real time bus data (unlatched) may be directly transferred from one bus to another.

Circuit operation is determined by the Control G, Direction, Clock AB, Clock BA, Select AB, Select BA
control inputs. The enable input, Contorl G, controls whether any bus outputs are enabled. The direction
control Direction (DIR), determines which bus is enabled, and hence the direction data flows: The Select
AB, Select BA inputs cotrol whether the latched data (stored in D type flip-flops), or the bus data (from
other bus input pins) is transferred. Each set of flip-flops has its own clock Clock AB and Clock BA, for
storing data. Data is latched on the rising edge of the clock.

Features

• High Speed Operation: tpd (Bus to Bus) = 14 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

HD74HC646/HD74HC648

Function Table

Inputs
Control Clock Select Data I/O Data I/O Operation or Function
G Direction BA AB AB BA A1 thru A8 B1 thru B8 HD74HC646 HD74HC648

H X X X X X Z (Input) Z (Input) Isolation Isolation
HX H H Z (Input) Z (Input) Store A & B data Store A & B data
L L X X X L Output Z (Input) B real-time data to

A bus

L L H H X H Output Z (Input) B stored data to A

bus

L L LLXHOutput Z (Input) B stored data to A

bus

L H X X L X Z (Input) Output A real-time data to

B bus

L H H H H X Z (Input) Output A stored data to B

bus

L H L L H X Z (Input) Output A stored data to B

bus

B real-time data to
A bus

B stored data to A
bus

B stored data to A
bus

A real-time data to
B bus

A stored data to B
bus

A stored data to B
bus

Bus A

Bus B

Real-time transfer
Bus B to Bus A

2

Bus A

Real-time transfer
Bus A to Bus B

Bus B

HD74HC646/HD74HC648

Bus A

Pin Arrangement

Storage from
A, B, or A and B

Clock AR

Select AB

Direciton

A

1

A

2

Bus B

Bus A

Bus B

Transfer stored data
to A or B

1
2
3
4
5

24
23
22
21
20

V

CC

Clock BA
Select BA
Control G
B

1

A
A
A
A
A
A

GND

6

3

7

4

8

5

9

6

10

7

11

8

12

19
18
17
16
15
14
13

B

2

B

3

B

4

B

5

B

6

B

7

B

8

(Top view)

3

HD74HC646/HD74HC648

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage range V
Input voltage V
Output voltage V
Output current I
DC current drain per VCC , GND ICC, I
DC input diode current I
DC output diode current I
Power Dissipation per package P

CC

IN

OUT

OUT

GND

IK

OK

T

Storage temperature Tstg –65 to +150 °C

Logic Diagram

HD74HC646

–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V

±35 mA
±75 mA
±20 mA
±20 mA

500 mW

x 7

V

CC

Q

CBA

A

1

Q

CAB

CAB

D

CBA

D

V

CC

B

1

CBACAB

SAB

DIR

SBA

G

4

HD74HC648

A

1

SAB
SBA

HD74HC646/HD74HC648

x 7

V

CC

Q

CBA

CBA

Q

CAB

CAB

D

D

V

CC

B

1

CBACAB
DIR

G

5

HD74HC646/HD74HC648

DC Characteristics

Ta = –40 to

Ta = 25°C

Item Symbol V

Input voltage V

IH

(V) Min Typ Max Min Max Unit Test Conditions

CC

2.0 1.5 — — 1.5 — V

4.5 3.15 — — 3.15 —

6.0 4.2 — — 4.2 —

V

IL

2.0 — — 0.5 — 0.5 V

4.5 — — 1.35 — 1.35

6.0 — — 1.8 — 1.8

Output voltage V

OH

2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA

4.5 4.4 4.5 — 4.4 —

6.0 5.9 6.0 — 5.9 —

4.5 4.18 — — 4.13 — IOH = –6 mA

6.0 5.68 — — 5.63 — IOH = –7.8 mA

V

OL

2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA

4.5 — 0.0 0.1 — 0.1

6.0 — 0.0 0.1 — 0.1

4.5 — — 0.26 — 0.33 IOL = 6 mA

6.0 — — 0.26 — 0.33 IOL = 7.8 mA

Off-state output

I

OZ

6.0 — — ±0.5 — ±5.0 µA Vin = VIH or VIL,

current
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply

I

CC

6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA

current

+85°C

Vout = V

or GND

CC

6

HD74HC646/HD74HC648

AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)

Ta = –40 to

Ta = 25°C

Item Symbol V

Maximum clock f

max

(V) Min Typ Max Min Max Unit Test Conditions

CC

2.0 — — 5 — 4 ns Clock AB to B or

frequency 4.5 — — 27 — 21 Clock BA to A

6.0 — — 32 — 25
Propagation delay t
time t

PLH

PHL

2.0 — — 170 — 215 ns A or B input to B or A output

4.5 — 14 34 — 43 (HD74HC646 only)

6.0 — — 29 — 37

t

PLH

t

PHL

2.0 — — 150 — 190 ns A or B input to B or A output

4.5 — 14 30 — 38 (HD74HC648 only)

6.0 — — 26 — 33

t

PLH

t

PHL

2.0 — — 220 — 275 ns Clock BA or Clock AB input to

4.5 — 18 44 — 55 A or B output

6.0 — — 37 — 47

t

PLH

t

PHL

2.0 — — 170 — 215 ns Select BA or Select AB input to

4.5 — 15 34 — 43 A or B output, with A or B high

6.0 — — 29 — 37

t

PLH

t

PHL

2.0 — — 170 — 215 ns Select BA or Select AB input to

4.5 — 16 34 — 43 A or B output, with A or B low

6.0 — — 29 — 37
Output enable t
time t

ZH

ZL

2.0 — — 150 — 190 ns Control G input or Direction to

4.5 — 17 30 — 38 A or B output

6.0 — — 26 — 33
Output disable t
time t

LZ

HZ

2.0 — — 150 — 190 ns Control G input to A or B

4.5 — 20 30 — 38 output

6.0 — — 26 — 33
Setup time t

su

2.0 100 — — 125 — ns

4.5 20 3 — 25 —

6.0 17 — — 21 —
Hold time t

h

2.0 5 — — 5 — ns

4.5 5 0 — 5 —

6.0 5 — — 5 —

+85°C

7

HD74HC646/HD74HC648

AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) (cont)

Ta = –40 to

Ta = 25°C

Item Symbol V

Pulse width t

w

(V) Min Typ Max Min Max Unit Test Conditions

CC

2.0 80 — — 100 — ns

4.5 16 5 — 20 —

6.0 14 — — 17 —
Output rise/fall t
time t

TLH

THL

2.0 — — 60 — 75 ns

4.5 — 4 12 — 15

6.0 — — 10 — 13
Input capacitance Cin — — 5 10 — 10 pF

+85°C

8

31.6

24 13

32.5 Max

13.4

15.0 Max

Unit: mm

112

1.2

15.24

2.13 Max

2.54 ± 0.25

0.48 ± 0.10

0.51 Min

2.54 Min 5.70 Max

0.25

0° – 15°

Hitachi Code
JEDEC
EIAJ

(reference value)

Weight

DP-24
Conforms
Conforms

3.1 g

+ 0.11
– 0.05

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received the latest product standards or specifications before final design, purchase or use.

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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.

4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail­safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.

5. This product is not designed to be radiation resistant.

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products.

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