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M27C2001-20B6TR 데이터시트(PDF) 9 Page - STMicroelectronics

부품명 M27C2001-20B6TR
상세설명  2 Mbit (256Kb x 8) UV EPROM and OTP EPROM
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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Device operation
M27C2001
9/25
be a high frequency capacitor of low inherent inductance and should be placed as close to
the device as possible. In addition, a 4.7µF bulk electrolytic capacitor should be used
between VCC and VSS for every eight devices. The bulk capacitor should be located near the
power supply connection point. The purpose of the bulk 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 M27C2001 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 exposure to ultraviolet light (UV EPROM). The
M27C2001 is in the programming mode when VPP input is at 12.75V, E is at VIL and P is
pulsed to VIL. The data to be programmed is applied to 8 bits in parallel to the data output
pins. The levels required for the address and data inputs are TTL. VCC is specified to be
6.25 ± 0.25V.
2.6
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows the whole array to be programmed with a
guaranteed margin, in a typical time of 26.5 seconds. Programming with PRESTO II
consists of applying a sequence of 100µs program pulses to each byte until a correct verify
occurs (see Figure 5). During programming and verify operation, a MARGIN MODE circuit is
automatically activated in order to guarantee that each cell is programmed with enough
margin. No overprogram pulse is applied since the verify in MARGIN MODE provides the
necessary margin to each programmed cell.
Figure 5.
Programming Flowchart
AI00715C
n = 0
Last
Addr
VERIFY
P = 100
µs Pulse
++n
= 25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL BYTES
1st: VCC = 6V
2nd: VCC = 4.2V
YES
NO
YES
NO
YES
NO


유사한 부품 번호 - M27C2001-20B6TR

제조업체부품명데이터시트상세설명
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