HD74HC190RP中文资料

HD74HC190/HD74HC191 Synchronous Up/Down Decade Counter (Single Clock Line) Synchronous Up/Donw 4-bit Binary Counter (Single Clock Line)

ADE-205-464 (Z)

1st. Edition

Sep. 2000 Description

The HD74HC190 and HD74HC191 are synchronous, reverside up/down counters. The HD74HC190 is a 4-bit decade counter and the HD74HC191 is a 4-bit binary counter. Synchronous counting operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters.

The outputs of the four flip-flops are triggered on a low-to-high-level transition of the clock input if the Enable G input is low. A high at Enable G inhibits counting. The direction of the count is determined by the level of the Down/ Up (D/U) input. When D/U is low, the counter counts up and when D/U is high, it counts down.

These counters feature a fully independent clock circuit. Changes at the control inputs (D/U) that will modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter will be dictated solely by the condition meeting the stable setup and hold times. These counters are fully programmable; that is, the outputs may each be preset to either level by placing a low on the load input and entering the desired data at the data inputs. The output will change to agree with the data inputs independently of the level of the clock input. This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs.

Two outputs have been made available to perform the cascading function. Ripple clock and maximum/minimum count. The latter output produces a high-level output pulse with a duration approximately qual to one complete cycle of the clock while the count is zero (all outputs low) counting down or maximum (9 or 15) counting up. The ripple clock output produces a low-level output pulse under those same conditions but only while the clock input is low. The counters can be easily cascaded by feeding the ripple clock output to the enable input of the succeeding counter if parallel clocking is used, or to the clock input if paralle enabling is used. The maximum/minimum count output can be used to accomplish look-ahead for high-speed operation.

HD74HC190/HD74HC191

Features

? High Speed Operation: t pd (Clock to Q) = 22 ns typ (C L = 50 pF)? High Output Current: Fanout of 10 LSTTL Loads

? Wide Operating Voltage: V CC = 2 to 6 V

? Low Input Current: 1 μA max

? Low Quiescent Supply Current: I CC (static) = 4 μA max (Ta = 25°C) Pin Arrangement

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HD74HC190/HD74HC191 Timing Chart

HD74HC190

Illustrated below is the following sequence:

1.Load (preset) to BCD seven.

2.Count up to eight, nine (maximum), zero, one and two.

3.Inhibit

4.Count down to one, zero (minimum), nine, eight and seven.

3

HD74HC190/HD74HC191

HD74HC191

Illustrated below is the following sequence:

1.Load (preset) to binary thirteen.

2.Count up to fourteen, fifteen (maximum), zero, one and two.

3.Inhibit

4.Count down to one, zero (minimum), fifteen, fourteen and thirteen.

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HD74HC190/HD74HC191 Logic Diagram

HD74HC190

5

HD74HC190/HD74HC191 HD74HC191

6

HD74HC190/HD74HC191

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DC Characteristics

Ta = 25°C

Ta = –40 to +85°C

Item Symbol V CC (V)Min Typ Max Min

Max Unit Test Conditions

Input voltage

V IH

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—0.5V 4.5—— 1.35—

1.356.0

—

—

1.8

— 1.8Output voltage

V OH

2.0 1.9 2.0— 1.9—V

Vin = V IH or V IL I OH = –20 μA

4.5 4.4 4.5— 4.4—6.0

5.9

6.0— 5.9—4.5 4.18—— 4.13—I OH = –4 mA 6.0

5.68——

5.63—I OH = –5.2 mA

V OL

2.0—0.00.1—0.1V

Vin = V IH or V IL I OL = 20 μA

4.5—0.00.1—0.16.0—0.00.1—

0.14.5——0.26—0.33I OL = 4 mA 6.0

——0.26—0.33I OL = 5.2 mA

Input current Iin 6.0——±0.1—±1.0μA Vin = V CC or GND

Quiescent supply current

I CC

6.0

—

—

4.0

—

40

μA

Vin = V CC or GND, Iout = 0 μA

HD74HC190/HD74HC191

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AC Characteristics (C L = 50 pF, Input t r = t f = 6 ns)

Ta = 25°C

Ta = –40 to +85°C

Item

Symbol V CC (V)Min Typ Max Min

Max Unit Test Conditions

Maximum clock f max

2.0——5—4MHz

frequency

4.5——25—206.0——29—24Propagation delay t PLH 2.0——265—

335ns

Load to Q

time

t PHL 4.5—2153—666.0——45—562.0——230—

290Data to Q

4.5—1846—586.0——39—492.0——120—

150Clock to RC 4.5—1424—306.0——20—262.0——190—

240Clock to Q 4.5—2238—486.0——32—412.0——250—

315Clock to max/min 4.5—2650—636.0——43—542.0——230—

290Down/up to RC 4.5—2046—586.0——39—492.0——130—

165G to RC 4.5—1426—336.0——22—282.0——190—

240Down/up to max/min 4.5—1738—486.0

——32—41Pulse width

t w

2.080——100—ns

4.5168—20—6.0

14–—17—Hold time

t h

2.00——0—ns 4.50–6—0—6.0

—

—

—

HD74HC190/HD74HC191

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AC Characteristics (C L = 50 pF, Input t r = t f = 6 ns) (cont)

Ta = 25°C

Ta = –40 to +85°C

Item Symbol V CC (V)Min Typ Max Min

Max Unit Test Conditions

Setup time

t su

2.0100——125—ns

4.5207—25—6.0

17——21—Output rise/fall t TLH 2.0——75—95ns time

t THL 4.5—515—196.0——13—16Input capacitance

Cin

—

—

5

10

—

10

pF

HD74HC190/HD74HC191 Package Dimensions

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HD74HC190/HD74HC191

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HD74HC190/HD74HC191

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Cautions

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

copyright, trademark, or other intellectual property rights for information contained in this document.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.

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Copyright ? Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.

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