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CD74HCT670EE4 Scheda tecnica(PDF) 1 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Il numero della parte CD74HCT670EE4
Spiegazioni elettronici  High-Speed CMOS Logic 4x4 Register File
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Data sheet acquired from Harris Semiconductor
SCHS195C
Features
• Simultaneous and Independent Read and Write
Operations
• Expandable to 512 Words of n-Bits
• Three-State Outputs
• Organized as 4 Words x 4 Bits Wide
• Buffered Inputs
• Typical Read Time = 16ns for ’HC670 VCC = 5V, CL =
15pF, TA = 25
oC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
Description
The ’HC670 and CD74HCT670 are 16-bit register files
organized as 4 words x 4 bits each. Read and write address
and enable inputs allow simultaneous writing into one location
while reading another. Four data inputs are provided to store
the 4-bit word. The write address inputs (WA0 and WA1)
determine the location of the stored word in the register.
When write enable (WE) is low the word is entered into the
address location and it remains transparent to the data. The
outputs will reflect the true form of the input data. When (WE)
is high data and address inputs are inhibited. Data acquisition
from the four registers is made possible by the read address
inputs (RA1 and RA0). The addressed word appears at the
output when the read enable (RE) is low. The output is in the
high impedance state when the (RE) is high. Outputs can be
tied together to increase the word capacity to 512 x 4 bits.
Pinout
CD54HC670
(CERDIP)
CD74HC670, CD74HCT670
(PDIP, SOIC)
TOP VIEW
Ordering Information
PART NUMBER
TEMP. RANGE
(oC)
PACKAGE
CD54HC670F3A
-55 to 125
16 Ld CERDIP
CD74HC670E
-55 to 125
16 Ld PDIP
CD74HC670M
-55 to 125
16 Ld SOIC
CD74HC670MT
-55 to 125
16 Ld SOIC
CD74HC670M96
-55 to 125
16 Ld SOIC
CD74HCT670E
-55 to 125
16 Ld PDIP
CD74HCT670M
-55 to 125
16 Ld SOIC
CD74HCT670MT
-55 to 125
16 Ld SOIC
CD74HCT670M96
-55 to 125
16 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel. The suffix T denotes a small-quantity reel of
250.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
D1
D2
D3
RA1
RA0
Q3
GND
Q2
VCC
WA0
WA1
WE
RE
Q0
Q1
D0
January 1998 - Revised October 2003
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© 2003, Texas Instruments Incorporated
CD54HC670, CD74HC670,
CD74HCT670
High-Speed CMOS Logic
4x4 Register File
[ /Title
(CD74H
C670,
CD74H
CT670)
/Subject
(High-
Speed
CMOS
Logic
4x4 Reg-
ister


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