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參數(shù)資料
| 型號(hào)： | HT27C512 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | OTP CMOS 64Kx 8-Bit EPROM |
| 中文描述： | 檢察官辦公室的CMOS 64Kx 8位存儲(chǔ)器 |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大小： | 257K |
| 代理商： | HT27C512 |
stable for at least t
ACC
-t
OE
.
Standby mode
The HT27C512 has CMOS standby mode which
reduces the maximum VCC current to 10
μ
A. It
is placed in CMOS standby when CE is at
V
CC
±
0.3V. The HT27C512 also has a TTL -
standby mode which reduces the maximum
VCC current to 1.0mA. It is placed in TTL-
standby when CE is at V
IH
. When in standby
mode, the outputs are in a high-impedance
state, independent of the OE input.
Two-line output control function
To accommodate multiple memory connections,
a two-line control function is provided to allow
for:
Low memory power consumption
Assurance that output bus contention will not
occur.
It is recommended that CE be decoded and used
as the primary device-selection function, while
OE be made a common connection to all devices
in the array and connected to the READ line
from the system control bus. This assures that
all deselected memory devices are in their low-
power standby mode and that the output pins
are only active when data is desired from a
particular memory device.
System considerations
During the switch between active and standby
conditions, transient current peaks are pro-
duced on the rising and falling edges of Chip
E nable. The magnitude of these transient cur-
rent peaks is dependent on the output capaci-
tance loading of the device. At a minimum, a
0.1
μ
F ceramic capacitor (high frequency, low
inherent inductance) should be used on each
device between VCC and VPP to minimize tran-
sient effects. In addition, to overcome the volt-
age drop caused by the inductive effects of the
printed circuit board traces on E PROM arrays,
a 4.7
μ
F bulk electrolytic capacitor should be
used between VCC and VPP for each eight de-
vices. The location of the capacitor should be
close to where the power supply is connected to
the array.
Operation mode truth table
All the operation modes are shown in the table following.
Mode
CE
OE /VPP
A0
A9
Output
Read
V
IL
V
IL
X (2)
X
Dout
Output Disable
V
IL
V
IH
X
X
High Z
Standby (TTL)
V
IH
X
X
X
High Z
Standby (CMOS)
V
CC
±
0.3V
X
X
X
High Z
Program
V
IL
V
PP
X
X
D
IN
Program Verify
V
IL
V
IL
X
X
D
OUT
Product Inhibit
V
IH
V
PP
X
X
High Z
Manufacturer Code (3)
V
IL
V
IL
V
IL
V
H
(1)
1C
Device Type Code (3)
V
IL
V
IL
V
IH
V
H
(1)
83
Notes: (1) V
H
= 12.0V
±
0.5V
(2) X=E ither V
IH
or V
IL
(3) For Manufacturer Code and Device Code, A1=V
IH
, When A1=V
IL
, both codes will read 7F
HT27C512
7
6th May ’99
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