HD74HC669 [HITACHI]

Synchronous UP/Down Decade,4-bit binary Counter; 同步向上/向下十年， 4位二进制计数器


型号：	HD74HC669
厂家：	HITACHI SEMICONDUCTOR
描述：	Synchronous UP/Down Decade,4-bit binary Counter 同步向上/向下十年， 4位二进制计数器计数器
文件：	总14页 (文件大小：86K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HD74HC668/HD74HC669

Synchronous UP/Down Decade Counter

Synchronous Up/Down 4-bit binary Counter

Description

This synchronous presettable decade counter features an internal carry look-ahead for cascading in high-

speed counting applications. Synchronous operation is provided by having all flip-flops clocked

simultaneously so that the outputs change coincident with each other when so instructed by the count-

enable inputs and internal gating. This mode of operation helps eliminate the output counting spikes that

are normally associated with asynchronous (ripple-clock) counters.

A buffered clock input triggers the four master-slave flip-flops on the rising (positive going) edge of the

clock waveform. This counter is fully programmable; that is, the outputs may each be preset to either level.

The load input circuitry allows loading with the carry-enable output of cascaded counters. As loading is

synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree

with the data inputs after the next clock pulse.

The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without

additional gating. Instrumental in accomplishing this function are two count enable inputs and a carry

output. Both count enable inputs (P and T) must be low to count. The direction of the count is determined

by the level of the up/down input. when the input is high, the counter counts up; when low, it counts down.

Input T is fed forward to enable the carry output. The carry output thus enabled will produce a low-level

output pulse with a duration approximately equal to the high portion of the Q_Aoutput when counting up

and approximately equal to the low portion of the Q_Aoutput when counting down. This low level overflow

carry pulse can be used to enable successive cascaded stages. Transitions at the enable P or T inputs are

allowed regardless of the level of the clock input. All inputs are diode-clamped to minimize transission-

line effects, thereby simplifying system design. This counter features a fully independent clock circuit.

Changes at control inputs (enable P, Enable T, load, up/down) that will modify the operating mode have no

effect until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting)

will be dictated solely by the conditions meeting the stable setup and hold times.

Features

•

High Speed Operation

High Output Current: Fanout of 10 LSTTL Loads

Wide Operating Voltage: V_CC= 2 to 6 V

Low Input Current: 1 µA max

HD74HC668/HD74HC669

•

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

Pin Arrangement

HD74HC668

U/D

16 V_CC

Ripple

carry

output

14 Q_A

13 Q_B

Data

inputs

Outputs

12 Q_C

11 Q_D

Enable

10 Enable T

GND

Load

(Top view)

HD74HC668/HD74HC669

HD74HC669

U/D

16 V_CC

Ripple

carry

output

14 Q_A

13 Q_B

12 Q_C

11 Q_D

Data

inputs

Outputs

Enable

GND

Load

(Top view)

HD74HC668/HD74HC669

Logic Diagram

HD74HC668

Q_A

U/D

D_A

Load

Enable P

Enable T

Q_B

D_B

Q_C

D_C

V_CC

Q_D

D_D

RCO

HD74HC668/HD74HC669

HD74HC669

Q_A

U/D

D_A

Load

Enable P

Enable T

Q_B

D_B

Q_C

D_C

Q_D

D_D

RCO

V_CC

HD74HC668/HD74HC669

Timing Chart

HD74HC668

Load

Data

inputs

Clock

U/D

Enable P and T

Q_A

Q_B

Q_C

Q_D

Ripple

carry

output

Count up

Inhibit

Count down

Load

HD74HC668/HD74HC669

HD74HC669

Load

Data

inputs

Clock

U/D

P and T

Q_A

Q_B

Q_C

Q_D

Ripple

carry

output

Count up

Inhibit

Count down

Load

HD74HC668/HD74HC669

DC Characteristics

Ta = –40 to

Ta = 25°C

+85°C

Item

Symbol V_CC(V) Min Typ Max Min Max Unit Test Conditions

Input voltage

V_IH

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

4.5

6.0

2.0

4.5

6.0

4.5

6.0

1.5

—

0.5

1.5

3.15

4.2

—

3.15 —

—

4.2

—

V_IL

0.5

1.35

1.8

—

1.35 —

1.8

—

Output voltage

V_OH

1.9 2.0

4.4 4.5

5.9 6.0

4.18 —

5.68 —

1.9

4.4

5.9

4.13

5.63

—

Vin = V_IHor V_ILI_OH= –20 µA

—

I_OH= –4 mA

I_OH= –5.2 mA

—

V_OL

—

0.0 0.1

0.1

0.33

Vin = V_IHor V_ILI_OL= 20 µA

—

0.26 —

±0.1 —

4.0

I_OL= 4 mA

I_OL= 5.2 mA

Input current

Iin

±1.0 µA

40 µA

Vin = V_CCor GND

Quiescent supply I_CC

current

—

Vin = V_CCor GND, Iout = 0 µA

HD74HC668/HD74HC669

AC Characteristics (C_L= 50 pF, Input t_r= t_f= 6 ns)

Ta = –40 to

+85°C

Ta = 25°C

Symbol V_CC(V) Min Typ Max Min Max Unit Test Conditions

Item

Maximum clock

Frequency

f_max

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

2.0

4.5

6.0

—

MHz

Propagation delay t_PLH

200 —

250 ns

Clock to Ripple carry out

Clock to Q

time

t_PHL

—

t_PLH

t_PHL

225 —

280 ns

—

t_PLH

t_PHL

150 —

190 ns

Enable T to Ripple carry out

U/D to Ripple carry out

—

t_PLH

t_PHL

200 —

250 ns

—

Pulse width

Setup time

t_w

100

—

t_su

100 —

125

Data to Clock

—

150 —

190

Enable P, T to Clock

Loadk to Clock

U/D to Clock

—

150 —

190

—

150 —

190

—

HD74HC668/HD74HC669

AC Characteristics (C_L= 50 pF, Input t_r= t_f= 6 ns) (cont)

Ta = –40 to

Ta = 25°C

+85°C

Item

Symbol V_CC(V) Min Typ Max Min Max Unit Test Conditions

Hold time

t_h

2.0

4.5

6.0

2.0

4.5

6.0

—

Output rise/fall

time

t_TLH

t_THL

—

Input capacitance Cin

Unit: mm

19.20

20.00 Max

1.3

1.11 Max

7.62

+ 0.13

– 0.05

0.25

2.54 ± 0.25

0.48 ± 0.10

0° – 15°

Hitachi Code

DP-16

JEDEC

EIAJ

Conforms

Weight (reference value) 1.07 g

Unit: mm

10.06

10.5 Max

+ 0.20

7.80

– 0.30

0.80 Max

1.15

0° – 8°

1.27

0.70 ± 0.20

*0.42 ± 0.08

0.40 ± 0.06

0.15

0.12

Hitachi Code

JEDEC

EIAJ

FP-16DA

—

Conforms

*Dimension including the plating thickness

Base material dimension

Weight (reference value) 0.24 g

Unit: mm

9.9

10.3 Max

1.27

+ 0.10

6.10

– 0.30

1.08

0.635 Max

0° – 8°

+ 0.67

0.60

– 0.20

*0.42 ± 0.08

0.40 ± 0.06

0.15

0.25

Hitachi Code

JEDEC

EIAJ

FP-16DN

Conforms

*Dimension including the plating thickness

Base material dimension

Weight (reference value) 0.15 g

Cautions

1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,

Hitachi bears no responsibility for problems that may arise with third party’s rights, including

intellectual property rights, in connection with use of the information contained in this document.

2. Products and product specifications may be subject to change without notice. Confirm that you have

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

3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,

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 fail-

safes, 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.

6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without

written approval from Hitachi.

7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor

products.

Hitachi, Ltd.

Semiconductor & Integrated Circuits.

Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan

Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109

URL

NorthAmerica

Europe

: http:semiconductor.hitachi.com/

: http://www.hitachi-eu.com/hel/ecg

Asia (Singapore)

Asia (Taiwan)

: http://www.has.hitachi.com.sg/grp3/sicd/index.htm

: http://www.hitachi.com.tw/E/Product/SICD_Frame.htm

Asia (HongKong) : http://www.hitachi.com.hk/eng/bo/grp3/index.htm

Japan

: http://www.hitachi.co.jp/Sicd/indx.htm

For further information write to:

Hitachi Semiconductor

(America) Inc.

Hitachi Europe GmbH

Hitachi Asia (Hong Kong) Ltd.

Group III (Electronic Components)

7/F., North Tower, World Finance Centre,

Harbour City, Canton Road, Tsim Sha Tsui,

Kowloon, Hong Kong

Tel: <852> (2) 735 9218

Fax: <852> (2) 730 0281

Hitachi Asia Pte. Ltd.

16 Collyer Quay #20-00

Hitachi Tower

Singapore 049318

Tel: 535-2100

Electronic components Group

Dornacher Stra§e 3

D-85622 Feldkirchen, Munich

Germany

Tel: <49> (89) 9 9180-0

Fax: <49> (89) 9 29 30 00

179 East Tasman Drive,

San Jose,CA 95134

Tel: <1> (408) 433-1990

Fax: <1>(408) 433-0223

Fax: 535-1533

Hitachi Asia Ltd.

Taipei Branch Office

3F, Hung Kuo Building. No.167,

Tun-Hwa North Road, Taipei (105)

Tel: <886> (2) 2718-3666

Fax: <886> (2) 2718-8180

Telex: 40815 HITEC HX

Hitachi Europe Ltd.

Electronic Components Group.

Whitebrook Park

Lower Cookham Road

Maidenhead

Berkshire SL6 8YA, United Kingdom

Tel: <44> (1628) 585000

Fax: <44> (1628) 778322

HD74HC669 [HITACHI]

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