Cypress CY7C1020BN User Manual
Page 3
CY7C1020BN
Document #: 001-06443 Rev. **
Page 3 of 8
AC Test Loads and Waveforms
Switching Characteristics
[5]
Over the Operating Range
Parameter
Description
7C1020BN-12
7C1020BN-15
Unit
Min.
Max.
Min.
Max.
Read Cycle
t
RC
Read Cycle Time
12
15
ns
t
AA
Address to Data Valid
12
15
ns
t
OHA
Data Hold from Address Change
3
3
ns
t
ACE
CE LOW to Data Valid
12
15
ns
t
DOE
OE LOW to Data Valid
6
7
ns
t
LZOE
OE LOW to Low Z
[6]
0
0
ns
t
HZOE
OE HIGH to High Z
[6, 7]
6
7
ns
t
LZCE
CE LOW to Low Z
[6]
3
3
ns
t
HZCE
CE HIGH to High Z
[6, 7]
6
7
ns
t
PU
CE LOW to Power-Up
0
0
ns
t
PD
CE HIGH to Power-Down
12
15
ns
t
DBE
Byte Enable to Data Valid
6
7
ns
t
LZBE
Byte Enable to Low Z
0
0
ns
t
HZBE
Byte Disable to High Z
6
7
ns
Write Cycle
[8]
t
WC
Write Cycle Time
12
15
ns
t
SCE
CE LOW to Write End
9
10
ns
t
AW
Address Set-Up to Write End
8
10
ns
t
HA
Address Hold from Write End
0
0
ns
t
SA
Address Set-Up to Write Start
0
0
ns
t
PWE
WE Pulse Width
8
10
ns
t
SD
Data Set-Up to Write End
6
8
ns
t
HD
Data Hold from Write End
0
0
ns
t
LZWE
WE HIGH to Low Z
[6]
3
3
ns
t
HZWE
WE LOW to High Z
[6, 7]
6
7
ns
t
BW
Byte Enable to End of Write
8
9
ns
Notes:
5. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
I
OL
/I
OH
and 30-pF load capacitance.
6. At any given temperature and voltage condition, t
HZCE
is less than t
LZCE
, t
HZOE
is less than t
LZOE
, and t
HZWE
is less than t
LZWE
for any given device.
7. t
HZOE
, t
HZBE
, t
HZCE
, and t
HZWE
are specified with a load capacitance of 5 pF as in part (b) of AC Test Loads. Transition is measured
±500 mV from steady-state
voltage.
8. The internal write time of the memory is defined by the overlap of CE LOW, WE LOW and BHE / BLE LOW. CE, WE and BHE / BLE must be LOW to initiate
a write, and the transition of these signals can terminate the write. The input data set-up and hold timing should be referenced to the leading edge of the signal
that terminates the write.
90%
10%
3.0V
GND
90%
10%
ALL INPUT PULSES
5V
OUTPUT
30 pF
INCLUDING
JIG AND
SCOPE
5V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
(a)
(b)
OUTPUT
R 481
Ω
R 481
Ω
R2
255
Ω
R2
255
Ω
167
Equivalent to: THÉVENIN
EQUIVALENT
1.73V
30 pF
Rise Time: 1 V/ns
Fall Time: 1 V/ns