HD74HC190 Hitachi Semiconductor, HD74HC190 Datasheet

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HD74HC190

Manufacturer Part Number
HD74HC190
Description
Synchronous Up/Down Decade/4-bit Binary Counter(Single Clock Line)
Manufacturer
Hitachi Semiconductor
Datasheet
HD74HC190/HD74HC191
Synchronous Up/Down Decade Counter (Single Clock Line)
Synchronous Up/Donw 4-bit Binary Counter (Single Clock Line)
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.

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HD74HC190 Summary of contents

Page 1

... Synchronous Up/Donw 4-bit Binary Counter (Single Clock Line) 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 ...

Page 2

... HD74HC190/HD74HC191 Features High Speed Operation: t (Clock typ (C pd High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: V Low Input Current: 1 µA max Low Quiescent Supply Current: I Pin Arrangement Inputs Data B Outputs Enable G Inputs Down/Up Outputs pF (static µ ...

Page 3

... Count up to eight, nine (maximum), zero, one and two. 3. Inhibit 4. Count down to one, zero (minimum), nine, eight and seven. Load Clock Down/Up Enable Max/Min Ripple Clock Count Up Inhibit Load HD74HC190/HD74HC191 Count Down 3 ...

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... 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. Load A B Data Inputs C D Clock Down/Up Enable ...

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... Logic Diagram HD74HC190 Clock Down/Up Input A Enable G Input B Input C Input D Load HD74HC190/HD74HC191 Ripple Clock Max/Min Output INCL INCL INCL INCL 5 ...

Page 6

... HD74HC190/HD74HC191 HD74HC191 Clock Down/Up Input A Enable G Input B Input C Input D Load 6 Ripple Clock Max/Min Output INCL INCL INCL INCL ...

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... HD74HC190/HD74HC191 Unit Test Conditions Vin = Vin = 1.0 A Vin = V or GND ...

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... HD74HC190/HD74HC191 AC Characteristics ( pF, Input t L Item Symbol V Maximum clock f 2.0 max frequency 4.5 6.0 Propagation delay t 2.0 PLH time t 4.5 PHL 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 Pulse width t 2.0 w 4.5 6.0 Hold time t 2.0 h 4 – +85 C (V) Min Typ Max Min Max CC — — 5 — 4 — — 25 — 20 — ...

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... Ta = – +85 C (V) Min Typ Max Min Max CC 100 — — 125 — — 25 — 17 — — 21 — — — 75 — 95 — — 19 — — 13 — 16 — — 10 HD74HC190/HD74HC191 Unit Test Conditions ...

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Max 16 1 1.3 1.11 Max 2.54 0.25 0.48 0. – 15 Hitachi Code JEDEC EIAJ Weight (reference value) Unit: mm 7.62 + 0.13 0.25 – 0.05 DP-16 Conforms Conforms 1.07 g ...

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Base material dimension 10.06 10.5 Max 9 8 0.80 Max 0.08 0.06 0.15 M 0.12 + 0.20 7.80 – 0.30 1.15 0 – 8 0.70 0.20 Hitachi Code FP-16DA JEDEC ...

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Base material dimension 9.9 10.3 Max 9 8 1.27 0.635 Max 0.15 0. 0.10 6.10 – 0.30 1.08 0 – 0.67 0.60 – 0.20 Hitachi ...

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

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