74F779PC

74F779PC Datasheet

74F779 8-Bit Bidirectional Binary Counter with 3-STATE Outputs

Part	Datasheet
74F779PC	74F779PC (pdf)

Related Parts	Information
74F779SC	74F779SC

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74F779 8-Bit Bidirectional Binary Counter with 3-STATE Outputs 74F779 8-Bit Bidirectional Binary Counter with 3-STATE Outputs The 74F779 is a fully synchronous 8-stage up/down counter with multiplexed 3-STATE I/O ports for bus-oriented applications. All control functions hold, count up, count down, synchronous load are controlled by two mode pins S0, S1 . The device also features carry lookahead for easy cascading. All state changes are initiated by the rising edge of the clock. s Multiplexed 3-STATE I/O ports s Built-in lookahead carry capability s Count frequency 100 MHz typ s Supply current 80 mA typ s Available in SOIC 300 mil only Ordering Code: Order Number 74F779SC 74F779PC Package Number Package Description M16B 16-Lead Small Outline Intergrated Circuit SOIC , JEDEC MS-013, Wide N16E 16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Logic Symbol Connection Diagram 2004 Fairchild Semiconductor Corporation DS009593 74F779 Unit Loading/Fan Out Pin Names S0, S1 OE CET CP TC Data Inputs Data Outputs Select Inputs Output Enable Input Active LOW Count Enable Trickle Input Active LOW Clock Pulse Input Active Rising Edge Terminal Count Output Active LOW U.L. HIGH/LOW 75/15 Input IIH/IIL Output IOH/IOL 5 µA/−0.2 mA −3 mA/24 mA 20 mA 5 µA/−0.2 mA 5 µA/−0.2 mA 5 µA/−0.2 mA 5 µA/−0.2 mA −1 mA/20 mA Function Table Not LL H = HIGH Voltage Level L = LOW Voltage Level = Immaterial = LOW-to-HIGH Clock Transition Not LL means S0 and S1 should never both be LOW level at the same time. Function I/O0 to I/O7 in High Z Flip-Flop Outputs Appear on I/O Lines Parallel Load All Flip-Flops Hold TC Held HIGH Count Up Count Down 74F779 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. 74F779 Absolute Maximum Ratings Note 1 Storage Temperature −65°C to +150°C Ambient Temperature under Bias −55°C to +125°C Junction Temperature under Bias −55°C to +150°C VCC Pin Potential to Ground Pin Input Voltage Note 2 −0.5V to +7.0V −0.5V to +7.0V Input Current Note 2 −30 mA to mA Voltage Applied to Output in HIGH State with VCC = 0V Standard Output 3-STATE Output −0.5V to VCC −0.5V to +5.5V

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74F779 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F779 8-Bit Bidirectional Binary Counter with 3-STATE Outputs

The 74F779 is a fully synchronous 8-stage up/down counter with multiplexed 3-STATE I/O ports for bus-oriented applications. All control functions hold, count up, count down, synchronous load are controlled by two mode pins S0, S1 . The device also features carry lookahead for easy cascading. All state changes are initiated by the rising edge of the clock.
s Multiplexed 3-STATE I/O ports s Built-in lookahead carry capability s Count frequency 100 MHz typ s Supply current 80 mA typ s Available in SOIC 300 mil only
Ordering Code:

Order Number 74F779SC 74F779PC

Package Number

Package Description

M16B
16-Lead Small Outline Intergrated Circuit SOIC , JEDEC MS-013, Wide

N16E
16-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide

Logic Symbol

Connection Diagram
2004 Fairchild Semiconductor Corporation DS009593
74F779

Unit Loading/Fan Out

Pin Names

S0, S1 OE CET CP TC

Data Inputs Data Outputs Select Inputs Output Enable Input Active LOW Count Enable Trickle Input Active LOW Clock Pulse Input Active Rising Edge Terminal Count Output Active LOW

U.L. HIGH/LOW 75/15

Input IIH/IIL Output IOH/IOL 5 µA/−0.2 mA −3 mA/24 mA 20 mA 5 µA/−0.2 mA 5 µA/−0.2 mA 5 µA/−0.2 mA 5 µA/−0.2 mA −1 mA/20 mA

Function Table

Not LL

H = HIGH Voltage Level L = LOW Voltage Level
= Immaterial = LOW-to-HIGH Clock Transition Not LL means S0 and S1 should never both be LOW level at the same time.

Function I/O0 to I/O7 in High Z Flip-Flop Outputs Appear on I/O Lines Parallel Load All Flip-Flops Hold TC Held HIGH Count Up Count Down
74F779

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.
74F779

Absolute Maximum Ratings Note 1

Storage Temperature
−65°C to +150°C

Ambient Temperature under Bias
−55°C to +125°C

Junction Temperature under Bias
−55°C to +150°C

VCC Pin Potential to Ground Pin Input Voltage Note 2
−0.5V to +7.0V −0.5V to +7.0V

Input Current Note 2
−30 mA to mA

Voltage Applied to Output
in HIGH State with VCC = 0V Standard Output 3-STATE Output
−0.5V to VCC −0.5V to +5.5V

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Datasheet ID: 74F779PC 513370