M27C202-90B1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M27C202-90B1 Datasheet PDF : 15 Pages
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M27C202
Table 9. Programming Mode DC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)
Symbol
Parameter
Test Condition
Min
Max
Unit
ILI
Input Leakage Current
0 ≤ VIN ≤ VIH
± 10
µA
ICC
Supply Current
IPP
Program Current
E = VIL
50
mA
50
mA
VIL
Input Low Voltage
VIH
Input High Voltage
–0.3
0.8
V
2
VCC + 0.5
V
VOL
Output Low Voltage
VOH
Output High Voltage TTL
IOL = 2.1mA
0.4
V
IOH = –400µA
2.4
V
VID
A9 Voltage
11.5
12.5
V
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
Table 10. Programming Mode AC Characteristics (1)
(TA = 25 °C; VCC = 6.25V ± 0.25V; VPP = 12.75V ± 0.25V)
Symbol
Alt
Parameter
Test Condition
Min
tAVPL
tAS Address Valid to Program Low
2
tQVPL
tDS Input Valid to Program Low
2
tVPHPL
tVPS VPP High to Program Low
2
tVCHPL
tVCS VCC High to Program Low
2
tELPL
tCES Chip Enable Low to Program Low
2
tPLPH
tPW Program Pulse Width
95
tPHQX
tDH Program High to Input Transition
2
tQXGL
tOES Input Transition to Output Enable Low
2
tGLQV
tOE Output Enable Low to Output Valid
tGHQZ (2)
tDFP Output Enable High to Output Hi-Z
0
tGHAX
tAH
Output Enable High to Address
Transition
0
Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP.
2. Sampled only, not 100% tested.
Max Unit
µs
µs
µs
µs
µs
105
µs
µs
µs
100
ns
130
ns
ns
Programming
When delivered (and after each ‘1’s erasure for UV
EPROM), all bits of the M27C202 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 exposure to ultraviolet
light (UV EPROM). The M27C202 is in the pro-
gramming mode when VPP input is at 12.75V, E is
at VIL and P 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 ad-
dress and data inputs are TTL. VCC is specified to
be 6.25V ± 0.25V.
7/15
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