HM5257165B/HM5257805B/HM5257405B-75/A6
AC Characteristics (Ta = 0 to +60หC, VCC, VCCQ = 3.3 V ยฑ 0.3 V, VSS, VSSQ = 0 V)
HM5257165B/
HM5257805B/
HM5257405B
-75
-A6
Parameter
PC/100
Symbol Symbol Min
Max
Min
System clock cycle time
(CAS latency = 2)
t CK
(CAS latency = 3)
t CK
CLK high pulse width
t CKH
CLK low pulse width
t CKL
Access time from CLK
(CAS latency = 2)
t AC
(CAS latency = 3)
t AC
Data-out hold time
t OH
CLK to Data-out low
t LZ
impedance
Tclk
10
โ
10
Tclk
7.5
โ
10
Tch
2.5
โ
3
Tcl
2.5
โ
3
Tac
โ
6
โ
Tac
โ
5.4
โ
Toh
2.7
โ
3
2
โ
2
CLK to Data-out high
t HZ
impedance
(CAS latency = 2, 3)
โ
5.4
โ
Input setup time
tAS, tCS, tDS, Tsi
1.5
โ
2
t CES
CKE setup time for power
t CESP
down exit
Tpde 1.5
โ
2
Input hold time
Ref/Active to Ref/Active
command period
tAH, tCH, tDH, Thi
0.8
โ
1
t CEH
t RC
Trc
67.5 โ
70
Active to Precharge command tRAS
period
Tras
45
120000 50
Active command to column tRCD
command (same bank)
Trcd
20
โ
20
Precharge to active command tRP
period
Trp
20
โ
20
Write recovery or data-in to tDPL
precharge lead time
Tdpl
15
โ
20
Active (a) to Active (b)
command period
t RRD
Trrd
15
โ
20
Transition time (rise and fall) tT
Refresh period
t REF
1
5
1
โ
64
โ
Max Unit Notes
โ
ns 1
โ
ns
โ
ns 1
โ
ns 1
6
ns 1, 2
6
ns
โ
ns 1, 2
โ
ns 1, 2, 3
6
ns 1, 4
โ
ns 1, 5, 6
โ
ns 1
โ
ns 1, 6
โ
ns 1
120000 ns 1
โ
ns 1
โ
ns 1
โ
ns 1
โ
ns 1
5
ns
64
ms
Data Sheet E0081H10
49