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74AC74BSTN/a8avaiDUAL D-TYPE FLIP FLOP WITH PRESET AND CLEAR
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74AC74B-74AC74M-74AC74MTR-74AC74TTR
DUAL D-TYPE FLIP FLOP WITH PRESET AND CLEAR
1/12April 2001 HIGH SPEED:
fMAX = 300MHz (TYP.) at VCC = 5V LOW POWER DISSIPATION:CC = 2μA(MAX.) at TA =25°C HIGH NOISE IMMUNITY:NIH = VNIL = 28 % VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING
CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24mA (MIN) BALANCED PROPAGATION DELAYS:PLH ≅ tPHL OPERATING VOLTAGE RANGE:CC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 74 IMPROVED LATCH-UP IMMUNITY
DESCRIPTION

The 74AC74 is an advanced high-speed CMOS
DUAL D-TYPE FLIP FLOP WITH PRESET AND
CLEAR fabricated with sub-micron silicon gate
and double-layer metal wiring C2 MOS tecnology.
A signal on the D INPUT is transferred to the Q
and Q OUTPUTS during the positive going
transition of the clock pulse.
CLEAR and PRESET are independent of the
clock and accomplished by a low setting on the
appropriate input.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74AC74

DUAL D-TYPE FLIP FLOP WITH PRESET AND CLEAR
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
74AC74
2/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE

X : Don’t Care
LOGIC DIAGRAM

This logic diagram has not be used to estimate propagation delays
74AC74
3/12
ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
RECOMMENDED OPERATING CONDITIONS

1) VIN from 30% to 70% of VCC
74AC74
4/12
DC SPECIFICATIONS

1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50Ω
74AC74
5/12
AC ELECTRICAL CHARACTERISTICS (C
L = 50 pF, RL = 500 Ω, Input tr = tf = 3ns)
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5.0V ± 0.5V
CAPACITIVE CHARACTERISTICS

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/2 (per
Flip-Flop)
74AC74
6/12
TEST CIRCUIT

CL = 50pF or equivalent (includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1: PROPAGATION DELAYS, SETUP AND HOLD TIMES, CLOCK PULSE WIDTHS

(f=1MHz; 50% duty cycle)
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