74374 Datasheet | SGS-Thomson

DESCRIPTION The M54/74HC374, M54/74HC534, are high speed CMOS OCTAL D-TYPE FLIP FLOP WITH 3-STATE OUTPUTS fabricated with in silicon gate C 2MOS technology. They have the same high speed performance of LSTTL bined with true CMOS low power suption. These8-bit D-type flip-flops are controlled by a clock input (CK) and an ouput enable input (OE). On the positive transition of the clock, the Q outputs will be set to the logic state that were setup at the D inputs (HC374) or their plements (HC534). While the OE input is low, the eight outputs will be in a normal logic state (high or low logic level), and PIN CONNECTION (top view) while high level, the outputs will be in a high impedance state. The output control does not affect the internal operation of flip-flops. That is, the old data can be retained or the new data can be entered even while the outputs are off. The application engineer has a choice of bination of inverting and non-inverting outputs. The HC374 and HC574 are identical, apart from pin layout. The 3-state output configuration and the wide choice of outline make bus-organized systems simple. All inputs are equipped with protection circuits against static discharge and transient excess voltage. - . . . B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HCXXXF1R M74HCXXXM1R M74HCXXXB1R M74HCXXXC1R March 1993 1/13 M54/M74HC374/534 INPUT AND OUTPUT EQUIVALENT CIRCUIT .. PIN DESCRIPTION (HC374) PIN No 1 2, 5, 6, 9, 12, 15, 16, 19 3, 4, 7, 8, 13, 14, 17, 18 11 10 20 SYMBOL OE Q0 to Q7 NAME AND FUNCTION 3 State output Enable Input (Active LOW) 3 State outputs PIN DESCRIPTION (HC534) PIN No 1 2, 5, 6, 9, 12, 15, 16, 19 3, 4, 7, 8, 13, 14, 17, 18 11 10 20 SYMBOL OE Q0 to Q7 NAME AND FUNCTION 3 State output Enable Input (Active LOW) 3 State outputs D0 to D7 Data Inputs D0 to D7 Data Inputs CLOCK GND V CC Clock Input (LOW to HIGH, edge triggered) Ground (0V) Positive Supply Voltage CLOCK GND...