dm74ls193 Fairchild Semiconductor, dm74ls193 Datasheet

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dm74ls193

Manufacturer Part Number
dm74ls193
Description
Synchronous 4-bit Binary Counter With Dual Clock
Manufacturer
Fairchild Semiconductor
Datasheet
© 2000 Fairchild Semiconductor Corporation
DM74LS193M
DM74LS193N
DM74LS193
Synchronous 4-Bit Binary Counter with Dual Clock
General Description
The DM74LS193 circuit is a synchronous up/down 4-bit
binary counter. Synchronous operation is provided by hav-
ing all flip-flops clocked simultaneously, so that the outputs
change together 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 master-slave flip-flops are triggered
by a LOW-to-HIGH level transition of either count (clock)
input. The direction of counting is determined by which
count input is pulsed while the other count input is held
HIGH.
The counter is fully programmable; that is, each output may
be preset to either level by entering the desired data at the
inputs while the load input is LOW. The output will change
independently of the count pulses. This feature allows the
counters to be used as modulo-N dividers by simply modi-
fying the count length with the preset inputs.
A clear input has been provided which, when taken to a
high level, forces all outputs to the low level; independent
Ordering Code:
Connection Diagram
Order Number
Package Number
M16A
N16E
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
DS006406
of the count and load inputs. The clear, count, and load
inputs are buffered to lower the drive requirements of clock
drivers, etc., required for long words.
These counters were designed to be cascaded without the
need for external circuitry. Both borrow and carry outputs
are available to cascade both the up and down counting
functions. The borrow output produces a pulse equal in
width to the count down input when the counter underflows.
Similarly, the carry output produces a pulse equal in width
to the count down input when an overflow condition exists.
The counters can then be easily cascaded by feeding the
borrow and carry outputs to the count down and count up
inputs respectively of the succeeding counter.
Features
Fully independent clear input
Synchronous operation
Cascading circuitry provided internally
Individual preset each flip-flop
Package Description
September 1986
Revised March 2000
www.fairchildsemi.com

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dm74ls193 Summary of contents

Page 1

... DM74LS193 Synchronous 4-Bit Binary Counter with Dual Clock General Description The DM74LS193 circuit is a synchronous up/down 4-bit binary counter. Synchronous operation is provided by hav- ing all flip-flops clocked simultaneously, so that the outputs change together when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple- clock) counters ...

Page 2

Logic Diagram www.fairchildsemi.com 2 ...

Page 3

Timing Diagram Note A: Clear overrides load, data, and count inputs Note B: When counting up, count-down input must be HIGH; when counting down, count-up input must be HIGH. 3 www.fairchildsemi.com ...

Page 4

Absolute Maximum Ratings Operating Free Air Temperature Range Supply Voltage Input Voltage Storage Temperature Range Recommended Operating Conditions Symbol V Supply Voltage CC V HIGH Level Input Voltage IH V LOW Level Input Voltage IL I HIGH Level Output Current ...

Page 5

AC Electrical Characteristics Symbol Parameter f Maximum Clock Frequency MAX t Propagation Delay Time PLH LOW-to-HIGH Level Output t Propagation Delay Time PHL HIGH-to-LOW Level Output t Propagation Delay Time PLH LOW-to-HIGH Level Output t Propagation Delay Time PHL HIGH-to-LOW ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0150” Narrow Body www.fairchildsemi.com Package Number M16A 6 ...

Page 7

Physical Dimensions Physical Dimensions inches (millimeters) unless otherwise noted (Continued) inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent ...

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