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M74HC670

ST Microelectronics
Part Number M74HC670
Manufacturer ST Microelectronics
Description 4 WORD X 4-BIT REGISTER
Published May 6, 2005
Detailed Description M54HC670 M74HC670 4 WORD X 4 BIT REGISTER FILE (3 STATE) . . . . . . . . HIGH SPEED tPD = 23 ns (TYP.) AT VCC = 5 V LO...
Datasheet PDF File M74HC670 PDF File

M74HC670
M74HC670

Overview
M54HC670 M74HC670 4 WORD X 4 BIT REGISTER FILE (3 STATE) .
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HIGH SPEED tPD = 23 ns (TYP.
) AT VCC = 5 V LOW POWER DISSIPATION ICC = 4 µA (MAX.
) AT TA = 25 °C HIGH NOISE IMMUNITY VNIH = VNIL = 28 % VCC (MIN.
) OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS SYMMETRICAL OUTPUT IMPEDANCE |IOH| = IOL = 4 mA (MIN.
) BALANCED PROPAGATION DELAYS tPLH = tPHL WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V PIN AND FUNCTION COMPATIBLE WITH 54/74LS670 B1R (Plastic Package) F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) ORDER CODES : M54HC670F1R M74HC670M1R M74HC670B1R M74HC670C1R PIN CONNECTIONS (top view) DESCRIPTION The M54/74HC670 is a high speed CMOS 4 WORD X 4 BIT REGISTER FILE (3-STATE) fabricated in silicon gate C2MOS technology.
It has the same high speed performance of LSTTL combined with true CMOS low power consumption.
The M54HC/74HC670 is a 4 x 4 Register File organized as four words by four bits.
Separate read and write inputs, both address and enable, allow simultaneous read and write operation.
The 3-state outputs make it possible to connect up to 128 outputs to increase the word capacity up to 512 words.
Any number of these devices can be operated in parallel to generate an n-bit length.
All inputs are equipped with protection circuits against static discharge and transient excess voltage.
October 1992 NC = No Internal Connection 1/12 M54/M74HC670 WRITE FUNCTION TABLE WRITE INPUTS WB L L H H X WA L H L H X WE L L L L H 0 Q=D Q0 Q0 Q0 Q0 WORDS 1 Q0 Q=D Q0 Q0 Q0 2 Q0 Q0 3 Q0 Q0 READ FUNCTION TABLE READ INPUTS RB L L H H X RA L H L H X RE L L L L H OUTPUTS Q0 Q1 Q2 Q3 W0B1 W0B2 W0B3 W0B4 W1B1 W1B2 W1B3 W1B4 W2B1 W2B2 W2B3 W2B4 W3B1 W3B2 W3B3 W3B4 Z Z Z Z Q=D Q0 Q0 Q=D Q0 Q0 Notes: 1 *: DON’T CARE Z: HIGH IMPEDANCE 2 (Q = D) = THE FOUR SELECT INTERNAL FLIP FLOP OUTPUTS WILL ASSUME THE STATES APPLIED TO THE FOUR EXTERNAL DATA INPUTS.
3 Q0 = THE LEVEL OF Q BEFORE THE INDICATED INPUT CONDITIONS WERE ESTABLISHED.
4 W0B1 = THE FIRST BIT...


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