Octal D-Type Flip-Flop
Description
TC74VHCT374AF/AFT/AFK
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74VHCT374AF, TC74VHCT374AFT, TC74VHCT374AFK
Octal D-Type Flip Flop with 3-State Output
The TC74VHCT374A is an advanced high speed CMOS OCTAL FLIP-FLOP with 3-STATE OUTPUT fabricated with silicon gate C2MOS technology.
It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.
This 8-bit D-type flip-flop is controlled by a clock input (CK) and an output enable input ( OE ).
When the OE input is high, the eight outputs are in a high impedance state.
The input voltage are compatible with TTL output voltage.
This device may be used as a level converter for interfacing 3.
3 V to 5 V system.
Input protection and output circuit ensure that 0 to 5.
5 V can be applied to the input and output (Note) pins without regard to the supply voltage.
These structure prevents device destruction due to mismatched supply and input/output voltages such as battery back up, hot board insertion, etc.
Note: Output in off-state
Features
• High speed: fmax = 140 MHz (typ.
) at VCC = 5 V • Low power dissipation: ICC = 4 μA (max) at Ta = 25°C • Compatible with TTL inputs: VIL = 0.
8 V (max)
VIH = 2.
0 V (min) • Power down protection is provided on all inputs and outputs.
• Balanced propagation delays: tpLH ≈ tpHL • Low noise: VOLP = 1.
5 V (max) • Pin and function compatible with the 74 series
(74AC/HC/F/ALS/LS etc.
) 374 type.
TC74VHCT374AF TC74VHCT374AFT TC74VHCT374AFK
Weight SOP20-P-300-1.
27A: TSSOP20-P-0044-0.
65A: VSSOP20-P-0030-0.
50:
0.
22 g (typ.
) 0.
08 g (typ.
) 0.
03 g (typ.
)
Start of commercial production
1995-12
1
2014-03-01
Pin Assignment
TC74VHCT374AF/AFT/AFK
IEC Logic Symbol
OE 1 Q0 2 D0 3 D1 4 Q1 5 Q2 6 D2 7 D3 8 Q3 9 GND 10
(top view)
20 VCC 19 Q7 18 D7 17 D6 16 Q6 15 Q5 14 D5 13 D4 12 Q4 11 CK
Truth Table
Inputs
OE CK D
H
X
X
L
X
L
L
L
H
X: Don’t care Z: High impedance Qn: No change
Output
Z Qn L H
System Diagram
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