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M27W400-100XK6TR Arkusz danych(PDF) 8 Page - STMicroelectronics

Numer części M27W400-100XK6TR
Szczegółowy opis  4 Mbit 512Kb x8 or 256Kb x16 Low Voltage UV EPROM and OTP EPROM
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27W400-100XK6TR Arkusz danych(HTML) 8 Page - STMicroelectronics

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M27W400
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Figure 7. BYTE Transition AC Waveforms
Note: Chip Enable (E) and Output Enable (G) = VIL.
AI01638B
tAXQX
tBHQV
A0-A17
BYTEVPP
tAVQV
tBLQX
tBLQZ
VALID
Hi-Z
A–1
DATA OUT
DATA OUT
VALID
Q0-Q7
Q8-Q15
Table 9. Programming Mode DC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.5V ± 0.25V)
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Symbol
Parameter
Test Condition
Min
Max
Unit
ILI
Input Leakage Current
0
≤ VIN ≤ VCC
±1
µA
ICC
Supply Current
50
mA
IPP
Program Current
E = VIL
50
mA
VIL
Input Low Voltage
–0.3
0.8
V
VIH
Input High Voltage
2.4
VCC + 0.5
V
VOL
Output Low Voltage
IOL = 2.1mA
0.4
V
VOH
Output High Voltage TTL
IOH = –2.5mA
3.5
V
VID
A9 Voltage
11.5
12.5
V
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27W400 are in the ’1’
state. Data is introduced by selectively program-
ming ’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 ultravio-
let light (UV EPROM). The M27W400 is in the pro-
gramming mode when VPP input is at 12.5V, G is
at VIH and E is pulsed to VIL. The data to be pro-
grammed 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.


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