To all our customers
Regarding the change of names mentioned in the document, such as Hitachi
Electric and Hitachi XX, to Renesas Technology Corp.
The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Hitachi, Hitachi, Ltd., Hitachi Semiconductors, and other Hitachi brand
names are mentioned in the document, these names have in fact all been changed to Renesas
Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and
corporate statement, no changes whatsoever have been made to the contents of the document, and
these changes do not constitute any alteration to the contents of the document itself.
Renesas Technology Home Page: http://www.renesas.com
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
Cautions
Keep safety first in your circuit designs!
1. Renesas Technology Corporation puts the maximum effort into making semiconductor products better
and more reliable, but there is always the possibility that trouble may occur with them. Trouble with
semiconductors may lead to personal injury, fire or property damage.
Remember to give due consideration to safety when making your circuit designs, with appropriate
measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or
(iii) prevention against any malfunction or mishap.
Notes regarding these materials
1. These materials are intended as a reference to assist our customers in the selection of the Renesas
Technology Corporation product best suited to the customer's application; they do not convey any
license under any intellectual property rights, or any other rights, belonging to Renesas Technology
Corporation or a third party.
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third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or
circuit application examples contained in these materials.
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subject to change by Renesas Technology Corporation without notice due to product improvements or
other reasons. It is therefore recommended that customers contact Renesas Technology Corporation
or an authorized Renesas Technology Corporation product distributor for the latest product information
before purchasing a product listed herein.
The information described here may contain technical inaccuracies or typographical errors.
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rising from these inaccuracies or errors.
Please also pay attention to information published by Renesas Technology Corporation by various
means, including the Renesas Technology Corporation Semiconductor home page
(http://www.renesas.com).
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information contained herein.
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or system that is used under circumstances in which human life is potentially at stake. Please contact
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when considering the use of a product contained herein for any specific purposes, such as apparatus or
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8. Please contact Renesas Technology Corporation for further details on these materials or the products
contained therein.
HD74HC192/HD74HC193
Synchronous Up/Down Decade Counter (Dual Clock Line)
Synchronous Up/Down 4-bit Binary Counter (Dual Clock Line)
ADE-205-465 (Z)
1st. Edition
Sep. 2000
Description
The HD74HC192 is a decade counter, and the HD74HC193 is a binary counter. Both counters have two
separate clock inputs, an up count input and a down count input. All outputs of the flip-flops are
simultaneously triggered on the low to high transition of either clock while the other input is held high.
The direction of counting is determined by which input is clocked.
These counters may be preset by entering the desired data on the data A, data B, data C, and data D inputs.
When the load input is taken low the data is loaded independently of either clock input. This feature allows
the counters to be used as divide-by-n counters by modifying the count length with the preset inputs.
In addition both counters can also be cleared. This is accomplished by inputting a high on the clear input.
All 4 internal stages are set to a low level independently of either count input.
Both a borrow and carry output are provided to enable cascading of both up and down counting functions.
The borrow output produces a negative going pulse when the counter underflows and the carry outputs a
pulse when the counter overflows. The counters can be cascaded by connecting the carry and borrow
outputs of one device to the count up and count down inputs, respectively, of the next device.
Features
•
•
•
•
•
High Speed Operation: t
pd
(Clock Up or Count Down to Q) = 21 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)
Microchip MCU
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