
WCMA2016U4X
5
Switching Characteristics Over the Operating Range[8] Parameter
Description
70 ns
Min
Max
Unit
READ CYCLE
tRC
Read Cycle Time
70
ns
tAA
Address to Data Valid
70
ns
tOHA
Data Hold from Address Change
10
ns
tACE
CE LOW to Data Valid
70
ns
tDOE
OE LOW to Data Valid
35
ns
tLZOE
5
ns
tHZOE
25
ns
tLZCE
10
ns
tHZCE
25
ns
tPU
CE LOW to Power-Up
0
ns
tPD
CE HIGH to Power-Down
70
ns
tDBE
BHE / BLE LOW to Data Valid
70
ns
tLZBE
BHE / BLE LOW to Low Z
[9]5
ns
tHZBE
25
ns
tWC
Write Cycle Time
70
ns
tSCE
CE LOW to Write End
60
ns
tAW
Address Set-Up to Write End
60
ns
tHA
Address Hold from Write End
0
ns
tSA
Address Set-Up to Write Start
0
ns
tPWE
WE Pulse Width
50
ns
tBW
BHE / BLE Pulse Width
60
ns
tSD
Data Set-Up to Write End
30
ns
tHD
Data Hold from Write End
0
ns
tHZWE
25
ns
tLZWE
10
ns
Notes:
8.
Test conditions assume signal transition time of 5 ns or less, timing reference levels of VCC(typ.)/2, input pulse levels of 0 to VCC(typ.), and
output loading of the specified IOL/IOH and 30 pF load capacitance.
9.
At any given temperature and voltage condition, tHZCE is less than tLZCE, tHZBE is less than tLZBE, tHZOE is less than tLZOE, and tHZWE is less
than tLZWE for any given device.
10. If both byte enables are toggled together this value is 10ns
11.
tHZOE, tHZCE, tHZBE, and tHZWE transitions are measured when the outputs enter a high impedance state.
12. The internal write time of the memory is defined by the overlap of WE, CE = VIL, BHE and/or BLE = VIL. All signals must be ACTIVE to initiate
a write and any of these signals can terminate a write by going INACTIVE. The data input set-up and hold timing should be referenced to the
edge of the signal that terminates the write..