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HD74HC670
4-by-4 Register File (with 3-state outputs)
ADE-205-521 1st. Edition Sep. 2000 Description
HD74HC670, 16-bit register file organized words bits each separate on-chip decoding provided addressing four word locations either write-in retrieve data. This permits simultaneous writing into location reading from another word location. Four data inputs available which used supply 4-bit word stored. Location word determined write-address inputs conjunction with write-enable signal. Data applied inputs should true form. That high-level signal desired from output, high-level applied data input that particular location. latch inputs arranged that data will accepted only both internal address gate inputs high. When this condition exists, data input transferred latch output. When write-enable input, high, data inputs inhibited their levels cuase change information stored internal latches. When read-enable input, (GR) high, data outputs inhibited into high-impedance state. individual address lines permit direct acquisition data stored four latches. Four individual decoding gates used complete address reading word. when read address made conjunction with read-enable signal, word appears four outputs.
Features
High Speed Operation: (Read Select High Output Current: Fanout LSTTL Loads Wide Operating Voltage: Input Current: Quiescent Supply Current: (static) 25°C)
HD74HC670
Function Table
Write Inputs Word
Read Inputs
Outputs
high level level irrelevant high impedance (off) four selected internal flip-flop outputs will assume states applied four external data inputs. level before indicated input conditions were established. first word etc.
HD74HC670
Arrangement
Data Outputs
Data Write Enable Read Outputs Write select
Read select
(Top view)
Logic Diagram
other three bits
Data
HD74HC670
Characteristics
25°C Item Input voltage Symbol +85°C 1.35 0.33 0.33 ±5.0 ±1.0 VIL, Vout GND, Iout -7.8 Unit Test Conditions
3.15 3.15
1.35 4.13 5.63
Output voltage
4.18 5.68
0.26 0.26 ±0.5 ±0.1
Off-state output current Input current Quiescent supply current
HD74HC670
Characteristics Input
25°C Item Symbol +85°C Write enable Write select Write enable Data Write select Write enable Data Write enable Data Write enable Unit Test Conditions Read select
Propagation delay time
Output enable time
Output disable time
Pulse width
Setup time
Hold time
HD74HC670
Characteristics Input (cont)
25°C Item Symbol +85°C Unit Test Conditions
Latch time latch data
Output rise/fall time
Input capacitance
HD74HC670
Package Dimensions
Unit:
19.20 20.00
1.11
7.40
6.30
0.51
2.54 5.06
7.62
2.54 0.25
0.48 0.10
0.25 0.05
Hitachi Code JEDEC EIAJ Mass (reference value)
0.13
DP-16 Conforms Conforms 1.07
Unit:
10.06 10.5
*0.22 0.05 0.20 0.04
0.80
0.20 7.80 0.30
2.20
1.15 0.70 0.20
1.27 *0.42 0.08 0.40 0.06
0.12
Hitachi Code JEDEC EIAJ Mass (reference value) FP-16DA Conforms 0.24
*Dimension including plating thickness Base material dimension
0.10 0.10
0.15
HD74HC670
Cautions
Hitachi neither warrants grants licenses rights Hitachi's third party's patent, copyright, trademark, other intellectual property rights information contained this document. Hitachi bears responsibility problems that arise with third party's rights, including intellectual property rights, connection with information contained this document. Products product specifications subject change without notice. Confirm that have received latest product standards specifications before final design, purchase use. Hitachi makes every attempt ensure that products high quality reliability. However, contact Hitachi's sales office before using product application that demands especially high quality reliability where failure malfunction directly threaten human life cause risk bodily injury, such aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment medical equipment life support. Design your application that product used within ranges guaranteed Hitachi particularly maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions other characteristics. Hitachi bears responsibility failure damage when used beyond guaranteed ranges. Even within guaranteed ranges, consider normally foreseeable failure rates failure modes semiconductor devices employ systemic measures such failsafes, that equipment incorporating Hitachi product does cause bodily injury, fire other consequential damage operation Hitachi product. This product designed radiation resistant. permitted reproduce duplicate, form, whole part this document without written approval from Hitachi. Contact Hitachi's sales office questions regarding this document Hitachi semiconductor products.
Hitachi, Ltd.
Semiconductor Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
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further information write
Hitachi Semiconductor (America) Inc. East Tasman Drive, Jose,CA 95134 Tel: (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic Components Group Dornacher Strae D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9180-0 Fax: <49> (89) Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 585160
Copyright Hitachi, Ltd., 2000. rights reserved. Printed Japan.
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