74AC169MTCX

74AC169MTCX Datasheet


74AC169 4-Stage Synchronous Bidirectional Counter

Part Datasheet
74AC169MTCX 74AC169MTCX 74AC169MTCX (pdf)
Related Parts Information
74AC169PC 74AC169PC 74AC169PC
74AC169SC 74AC169SC 74AC169SC
74AC169SJX 74AC169SJX 74AC169SJX
74AC169SCX 74AC169SCX 74AC169SCX
74AC169MTC 74AC169MTC 74AC169MTC
74AC169SJ 74AC169SJ 74AC169SJ
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74AC169 4-Stage Synchronous Bidirectional Counter
74AC169 4-Stage Synchronous Bidirectional Counter

The AC169 is fully synchronous 4-stage up/down counter. The AC169 is a modulo-16 binary counter. It features a preset capability for programmable operation, carry lookahead for easy cascading and a U/D input to control the direction of counting. All state changes, whether in counting or parallel loading, are initiated by the LOW-to-HIGH transition of the Clock.
s ICC reduced by 50% s Synchronous counting and loading s Built-In lookahead carry capability s Presettable for programmable operation s Outputs source/sink 24 mA
Ordering Code:

Order Number 74AC169SC 74AC169SJ 74AC169MTC 74AC169PC

Package Number

Package Description

M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow Body

M16D
16-Lead Small Outline Package SOP , EIAJ TYPE II, 5.3mm Wide

MTC16
16-Lead Thin Shrink Small Outline Package TSSOP , JEDEC MO-153, 4.4mm Wide

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.

Logic Symbols

Connection Diagram

IEEE/IEC

Pin Descriptions

Pin Names CEP CET CP PE U/D TC

Description Count Enable Parallel Input Count Enable Trickle Input Clock Pulse Input Parallel Data Inputs Parallel Enable Input Up-Down Count Control Input Flip-Flop Outputs Terminal Count Output
is a trademark of Fairchild Semiconductor Corporation.
1999 Fairchild Semiconductor Corporation DS009934
74AC169

Functional Description

The AC169 uses edge-triggered J-K-type flip-flops and have no constraints on changing the control or data input signals in either state of the Clock. The only requirement is that the various inputs attain the desired state at least a setup time before the rising edge of the clock and remain valid for the recommended hold time thereafter. The parallel load operation takes precedence over the other operations, as indicated in the Mode Select Table. When PE is LOW, the data on the inputs enters the flip-flops on the next rising edge of the Clock. In order for counting to occur, both CEP and CET must be LOW and PE must be HIGH the U/D input then determines the direction of counting. The Terminal Count TC output is normally HIGH and goes LOW, provided that CET is LOW, when a counter reaches zero in the Count Down mode or reaches 15 in the Count Up mode. The TC output state is not a function of the Count Enable Parallel CEP input level. If an illegal state occurs, the AC169 will return to the legitimate sequence within two counts. Since the TC signal is derived by decoding the flip-flop states, there exists the possibility of decoding spikes on TC. For this reason the use of TC as a clock signal is not recommended see logic equations below .

Count Enable = CEP
•CET
• PE

Up TC = Q0•Q1•Q 2Q3• Up
•CET

Down TC = Q0• Q1•Q2•Q3
• Down
•CET

Mode Select Table

PE CEP CET

H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial

Action on Rising U/D

Clock Edge

X Load Pn to Qn H Count Up Increment

L Count Down Decrement

X No Change Hold

X No Change Hold

State Diagram

Logic Diagram

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
74AC169

Absolute Maximum Ratings Note 1

Supply Voltage VCC DC Input Diode Current IIK

VI = −0.5V VI = VCC + 0.5V DC Input Voltage VI DC Output Diode Current IOK VO = −0.5V VO = VCC + 0.5V DC Output Voltage VO DC Output Source
or Sink Current IO DC VCC or Ground Current
per Output Pin ICC or IGND Storage Temperature TSTG Junction Temperature TJ

PDIP
−0.5V to +7.0V
−20 mA +20 mA −0.5V to VCC + 0.5V
−20 mA +20 mA −0.5V to VCC + 0.5V
±50 mA
±50 mA −65°C to +150°C
140°C

Recommended Operating Conditions
More datasheets: 18053ACU | BXRE-40E3001-D-03 | BXRE-30E3001-D-03 | FDP5690 | FDB5690 | 74AC169PC | 74AC169SC | 74AC169SJX | 74AC169SCX | 74AC169MTC


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Datasheet ID: 74AC169MTCX 513083