Fairchild Semiconductor DM7474N, DM7474M Datasheet

September 1986 Revised February 2000

DM7474 Dual Positive-Edge-Triggered D-Type Flip-Flops with

Preset, Clear and Complementary Outputs

DM7474 Dual Positive-Edge-Triggered D-Type Flip-Flops with Pres et, Clear and Complementary Outputs

General Description

This device contains two independent positive-edge-triggered D-type flip-flops with complementary outputs. The information on the D i nput is accepted by the flip-flops on the positive going edge of the clock pulse. The triggering occurs at a voltage level and is not directly r elated to the

transition time of the rising ed ge of the clock. The data on the D input may be changed wh ile the clock is LOW or HIGH without affecting the outputs as long as the data setup and hold times are not violated. A LOW logic level on the preset or clear inputs will set or reset the outputs regardless of the logic levels of the other inputs.

Ordering Code:

Order Number Package Number Package Description

DM7474M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM7474N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.

Connection Diagram Function Table

Inputs Outputs

PR CLR CLK D Q Q

LHXXHL HLXXLH LLXXH

HH↑ HHL HH↑ LLH HHLXQ

H = HIGH Logic Level X = Either LOW or HIGH Logic Level L = LOW Logic Level ↑ = Positive-going transit ion of the clock.

= The out put logic lev el of Q be fore the in dica ted input con ditio ns were

established.

Note 1: This configuration is nonstable; that is, it will not persist when either the preset and/or clear inputs return to thei r inactive (HIGH) level.

(Note 1)H(Note 1)

Absolute Maximum Ratings(Note 2)

Supply Voltage 7V

DM7474

Input Voltage 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C

Note 2: The “Absolute Maximum Ratin gs” are those v alues beyon d which the safety of the dev ice cannot be guaranteed. T he device sh ould not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommend ed O peratin g Cond itions” t able w ill defin e the c ondit ions for actual device operation.

Recommended Operating Conditions

Symbol Parameter Min Nom Max Units

V V V I I f t

CC IH

IL OH OL CLK W

Supply Voltage 4.75 5 5.25 V HIGH Level Input Voltage 2 V LOW Level Input Voltage 0.8 V HIGH Level Output Current −0.4 mA LOW Level Output Current 16 mA Clock Frequency (Note 4) 0 15 MHz Pulse Width Clock HIGH 30 (Note 4) Clock LOW 37

Clear LOW 30 Preset LOW 30

Note 3: The symbol (↑) indicates the rising edge of the clock pulse is used for reference. Note 4: T

Input Setup Time (Note 3)(Note 4) 20↑ ns Input Hold Time (Note 3)(Note 4) 5↑ ns Free Air Operating Temperature 0 70 °C

= 25°C and VCC = 5V.

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

Note 5: All typicals are at VCC = 5V, TA = 25°C. Note 6: Not more than one output should be shorted at a time.

Note 7: With all outputs open, I Note 8: Clear is tested with preset HIGH and preset is tested with clear HIGH.

Input Clamp Voltage VCC = Min, II = −12 mA −1.5 V HIGH Level VCC = Min, IOH = Max Output Voltage VIL = Max, VIH = Min LOW Level VCC = Min, IOL = Max Output Voltage VIH = Min, VIL = Max Input Current @ Max Input Voltage VCC = Max, VI = 5.5V 1 mA HIGH Level VCC = Max D 40 Input Current VI = 2.4V Clock 80

LOW Level VCC = Max D −1.6 Input Current VI = 0.4V Clock −3.2

(Note 8) Clear −3.2

Short Circuit Output Current VCC = Max (Note 6) −18 −55 mA Supply Current VCC = Max (Note 7) 17 30 mA

is measured with the Q and Q outputs HIGH in tur n. At th e t im e of measurement the c loc k is grounded.

Clear 120 Preset 40

Preset −1.6

2.4 3.4 V

Typ

(Note 5)

0.2 0.4 V

Max Units

µA

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