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PDF ( 数据手册 , 数据表 ) HN27C256HG

零件编号 HN27C256HG
描述 32768-word x 8-bit CMOS UV Erasable and Programmable ROM
制造商 Hitachi Semiconductor
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HN27C256HG 数据手册, 描述, 功能
HN27C256HG Series
32768-word × 8-bit CMOS UV Erasable and Programmable
ROM
ADE-203-
Maintenance only
Rev. 0.0
Dec. 1, 1995
Description
The Hitachi HN27C256HG is a 256-kbit ultraviolet erasable and electrically programmable ROM,
featuring sub-100-ns access times. The HN27C256HG realizes access time of 70 ns and 85 ns,
employing the advanced fine process and high speed circuitry technique. The timing conditions such as
access time or output hold time are designed as same as our byte-wide SRAMs’, allowing to use with
SRAMs on the same memory board by the same read timings. So its board design in 16-bit
microprocessor systems is easy. Also, the HN27C256HG realizes faster programming time than our
conventional 256-kbit EPROM by Hitachi’s Fast High-Reliability Programming Algorithm. Pin
arrangement, pin configuration and programming voltage are compatible with our 256-kbit EPROM
series, therefore existing programmers can be used with the HN27C256HG.
Features
• High speed: Access time 70/85 ns (max)
• Low power dissipation
Active mode: 30 mW (typ) (f = 1 MHz)
• High reliability and fast programming
Programming voltage: +12.5 V DC
Fast High-Reliability Programming Algorithm available
• Device identifier mode
Manufacturer code and device code
Ordering Information
Type No.
HN27C256HG-70
HN27C256HG-85
Access Time
70 ns
85 ns
Package
600-mil 28-pin cerdip (DG-28)
Note: This device is not available for new application.







HN27C256HG pdf, 数据表
HN27C256HG Series
DC Characteristics (Ta = 25°C ± 5°C, VCC = 6 V ± 0.25 V, VPP = 12.5 V ± 0.5 V)
Parameter
Symbol Min Typ Max Unit Test Conditions
Input leakage current
ILI — — 2
µA Vin = 0 V to VCC
VPP supply current
IPP — — 30 mA CE = VIL
Operating VCC current
ICC — — 30 mA
Input low level
VIL
0.1*5
0.8
V
Input high level
VIH 2.2
VCC + 0.5*6 V
Output low voltage during verify VOL
0.45 V
IOL = 2.1 mA
Output high voltage during verify VOH 2.4
V
IOH = 400 µA
Notes: 1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.
2. VPP must not exceed 13.5 V including overshoot.
3. An influence may be had upon device reliability if the device is installed or removed while VPP =
12. 5V.
4. Do not alter VPP either VIL to 12.5 V or 12.5 V to VIL when CE = Low.
5. VIL min = 0.6 V for pulse width 20 ns.
6. If VIH is over the specified maximum value, programming operation cannot be guaranteed.
8







HN27C256HG equivalent, schematic
HN27C256HG Series
Supply Current – Frequency
Ta = 25°C
2.0 VCC = 5 V
1.5
1.0
0.5
0 5 10 15
Frequency f (MHz)
Access Time – Supply Voltage
2.0
1.5
1.0
0.5
0
4 56
Supply Voltage VCC (V)
16










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