AT27C512R-12 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
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AT27C512R-12 Datasheet PDF : 9 Pages
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AT27C512R
AC Programming Characteristics
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, OE/VPP = 13.0 ± 0.25V
Sym-
bol Parameter
Test
Condtions* (1)
tAS Address Setup Time
tOES OE/VPP Setup Time
tOEH OE/VPP Hold Time
tDS Data Setup Time
tAH Address Hold Time
tDH Data Hold Time
tDFP
CE High to
Output Float Delay (2)
tVCS
tPW
tDV
VCC Setup Time
CE Program Pulse Width (3)
Data Valid from CE (2)
tVR OE/VPP Recovery Time
tPRT
OE/VPP Pulse Rise
Time During Programming
Limits
Min Max
2
2
2
2
0
2
0 130
2
95 105
1
2
50
Units
µs
µs
µs
µs
µs
µs
ns
µs
µs
µs
µs
ns
*AC Conditions of Test:
Input Rise and Fall Times (10% to 90%).............. 20 ns
Input Pulse Levels....................................0.45V to 2.4V
Input Timing Reference Level....................0.8V to 2.0V
Output Timing Reference Level.................0.8V to 2.0V
Notes: 1. VCC must be applied simultaneously or before
OE/VPP and removed simultaneously or after
OE/VPP.
2. This parameter is only sampled and is not 100%
tested. Output Float is defined as the point where
data is no longer driven — see timing diagram.
3. Program Pulse width tolerance is 100 µsec ± 5%.
Rapid Programming Algorithm
A 100 µs CE pulse width is used to program. The address
is set to the first location. VCC is raised to 6.5V and
OE/VPP is raised to 13.0V. Each address is first pro-
grammed with one 100 µs CE pulse without verification.
Then a verification/reprogramming loop is executed for
each address. In the event a byte fails to pass verification,
up to 10 successive 100 µs pulses are applied with a veri-
fication after each pulse. If the byte fails to verify after 10
pulses have been applied, the part is considered failed.
After the byte verifies properly, the next address is se-
lected until all have been checked. OE/VPP is then low-
ered to VIL and VCC to 5.0V. All bytes are read again and
compared with the original data to determine if the device
passes or fails.
Atmel’s 27C512R Integrated
Product Identification Code
Codes
Pins
Hex
A0 O7 O6 O5 O4 O3 O2 O1 O0 Data
Manufacturer 0 0 0 0 1 1 1 1 0 1E
Device Type 1 0 0 0 0 1 1 0 1 0D
3-141
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