CY7C185
Document #: 38-05043 Rev. *A Page 4 of 11
Switching Characteristics Over the Operating Range[6]
7C185-15 7C185-20 7C185-25 7C185-35
Parameter Description Min. Max. Min. Max. Min. Max. Min. Max. Unit
Read Cycle
tRC Read Cycle Time 15 20 25 35 ns
tAA Address to Data Valid 15 20 25 35 ns
tOHA Data Hold from Address Change 3 5 5 5 ns
tACE1 CE1 LOW to Data Valid 15 20 25 35 ns
tACE2 CE2 HIGH to Data Valid 15 20 25 35 ns
tDOE OE LOW to Data Valid 8 9 12 15 ns
tLZOE OE LOW to Low Z 3 3 3 3 ns
tHZOE OE HIGH to High Z[7] 7 8 10 10 ns
tLZCE1 CE1 LOW to Low Z[8] 3 5 5 5 ns
tLZCE2 CE2 HIGH to Low Z 3 3 3 3 ns
tHZCE CE1 HIGH to High Z[7, 8]
CE2 LOW to High Z 7 8 10 10 ns
tPU CE1 LOW to Power-Up
CE2 to HIGH to Power-Up 0 0 0 0 ns
tPD CE1 HIGH to Power-Down
CE2 LOW to Power-Down 15 20 20 20 ns
Write Cycle[9]
tWC Write Cycle Time 15 20 25 35 ns
tSCE1 CE1 LOW to Write End 12 15 20 20 ns
tSCE2 CE2 HIGH to Write End 12 15 20 20 ns
tAW Address Set-up to Write End 12 15 20 25 ns
tHA Address Hold from Write End 0 0 0 0 ns
tSA Address Set-up to Write Start 0 0 0 0 ns
tPWE WE Pulse Width 12 15 15 20 ns
tSD Data Set-up to Write End 810 10 12 ns
tHD Data Hold from Write End 0 0 0 0 ns
tHZWE WE LOW to High Z[7] 7 7 7 8 ns
tLZWE WE HIGH to Low Z 3 5 5 5 ns
Notes:
6. Test conditions assume signal transition time of 5 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
IOL/IOH and 30-pF load capacitance.
7. tHZOE, tHZCE, and tHZWE are specified with CL = 5 pF as in part (b) of AC Test Loads. Transition is measured ±500 mV from steady state voltage.
8. At any given temperature and voltage condition, tHZCE is less than tLZCE1 and tLZCE2 for any given device.
9. The internal write time of the memory is defined by the overlap of CE 1 LOW, CE2 HIGH, and WE LOW. All 3 signals must be active to initiate a write and either
signal can terminate a write by going HIGH. The data input set-up and hold timing should be referenced to the ri sing edge of the signal that terminates the write.