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M27C322-100F3 데이터시트(PDF) 8 Page - STMicroelectronics

부품명 M27C322-100F3
상세설명  32 Mbit (2Mb x16) UV EPROM and OTP EPROM
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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Device operation
M27C322
8/24
2.4
System Considerations
The power switching characteristics of Advanced CMOS EPROMs require careful
decoupling of the supplies to the devices. The supply current ICC has three segments of
importance to the system designer: the standby current, the active current and the transient
peaks that are produced by the falling and rising edges of E. The magnitude of the transient
current peaks is dependent on the capacitive and inductive loading of the device outputs.
The associated transient voltage peaks can be suppressed by complying with the two line
output control and by properly selected decoupling capacitors. It is recommended that a
0.1µF ceramic capacitor is used on every device between VCC and VSS. This should be a
high frequency type of low inherent inductance and should be placed as close as possible to
the device. In addition, a 4.7µF electrolytic capacitor should be used between VCC and VSS
for every eight devices. This capacitor should be mounted near the power supply connection
point. The purpose of this capacitor is to overcome the voltage drop caused by the inductive
effects of PCB traces.
2.5
Programming
When delivered (and after each erasure for UV EPROM), all bits of the M27C322 are in the
"1" state. Data is introduced by selectively programming "0"s into the desired bit locations.
Although only "0"s will be programmed, both "1"s and "0"s can be present in the data word.
The only way to change a "0" to a "1" is by die exposition to ultraviolet light (UV EPROM).
The M27C322 is in the programming mode when VPP input is at 12.V, GVPP is at VIH and E
is pulsed to VIL. The data to be programmed is applied to 16 bits in parallel to the data
output pins. The levels required for the address and data inputs are TTL. VCC is specified to
be 6.25V ± 0.25V.
2.6
PRESTO III Programming Algorithm
The PRESTO III Programming Algorithm allows the whole array to be programed with a
guaranteed margin in a typical time of 100 seconds. Programming with PRESTO III consists
of applying a sequence of 50µs program pulses to each word until a correct verify occurs
(see Figure 3). During programing and verify operation a MARGIN MODE circuit must be
activated to guarantee that each cell is programed with enough margin. No overprogram
pulse is applied since the verify in MARGIN MODE provides the necessary margin to each
programmed cell.


유사한 부품 번호 - M27C322-100F3

제조업체부품명데이터시트상세설명
logo
STMicroelectronics
M27C322-100F3 STMICROELECTRONICS-M27C322-100F3 Datasheet
112Kb / 13P
   32 Mbit (2Mb x16) UV EPROM and OTP EPROM
April 2000
More results

유사한 설명 - M27C322-100F3

제조업체부품명데이터시트상세설명
logo
STMicroelectronics
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