AT27C512R
AC Programming Characteristics
RapidProgramming Algorithm
TA = 25 ± 5°C, VCC = 6.5 ± 0.25V, OE/VPP = 13.0 ± 0.25V
A 100 µs CE pulse width is used to program. The address
is set to the first location. V
is raised to 6.5V and
CC
Sym-
bol
Test
Condtions*
Limits
Units
OE/V is raised to 13.0V. Each address is first pro-
PP
(1)
Parameter
Min
Max
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-
Address Setup Time
OE/VPP Setup Time
OE/VPP Hold Time
Data Setup Time
Address Hold Time
Data Hold Time
2
2
2
2
0
2
µs
µs
µs
µs
µs
µs
t
t
t
t
t
t
AS
OES
OEH
DS
AH
lected until all have been checked. OE/V is then low-
PP
DH
ered to V and V to 5.0V. All bytes are read again and
IL
CC
CE High to
compared with the original data to determine if the device
passes or fails.
0
130
ns
Output Float Delay (2)
t
DFP
VCC Setup Time
2
µs
µs
µs
µs
t
t
t
t
VCS
PW
DV
CE Program Pulse Width (3)
Data Valid from CE (2)
OE/VPP Recovery Time
95
105
1
2
VR
OE/VPP Pulse Rise
Time During Programming
50
ns
t
PRT
*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%.
Atmel’s 27C512R Integrated
Product Identification Code
Pins
Hex
Codes
Data
A0 O7 O6 O5 O4 O3 O2 O1 O0
Manufacturer
Device Type
0
1
0
0
0
0
0
0
1
0
1
1
1
1
1
0
0
1
1E
0D
3-141
ATMEL [ ATMEL ]
