NTE21256 Datasheet, PDF (3/6 Pages) NTE Electronics – 262,144-Bit Dynamic Random Access Memory (DRAM)

DC Characteristics: (T_A = 0° to +70°C, V_SS = 0V, V_CC = +5V ±10% unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Input High Voltage (All Inputs)
Input Low Voltage (All Inputs)
Output High Voltage
Output Low Voltage
Average V_CC Supply Current
Standby V_CC Supply Current
Average V_CC Supply Current during
RAS–only refresh cycles
V_IH Notes 2, Note3
V_IL Notes 2, Note3
V_OH Note 4
V_OL Note 5
I_CC1 t_RC = 260ns, Note 6
I_CC2 Note 7
I_CC3 Note 6
2.4 – V_CC +1 V
–1.0 –
0.8
V
2.4 –
–
V
––
0.4
V
––
70 mA
––
5 mA
––
65 mA
Average V_CC supply Current during
Page Mode
I_CC4 Note 6
––
55 mA
Input Leakage Current (Any Input)
Output Leakage Current
Supply Voltage
I_{I (L)}
––
I_{O (L)} CAS at Logic 1, 0 ≤ V out ≤ 5.5 – –
V_CC Note 2
4.5 –
V_SS
0–
10 µA
10 µA
5.5 V
0
V
Note 2. All voltages referenced to V_SS.
Note 3. Overshooting and undershooting on input levels of +6.5V or –2V for a period 0f 30ns Max.
will influence function and reliability of the device.
Note 4. I_OH = 4mA and 100pf load.
Note 5. I_OL = 4mA and 100pf load.
Note 6. I_CC depends on frequency of operation. Maximum current is measured at the fastest cycle
rate.
Note 7. RAS and CAS are both at V_IH.
Capacitance: (Note 6)
Parameter
Symbol Test Conditions
Input Capacitance (A0–A8, DI)
C_I1
Input Capacitance (RAS, CAS, WE)
C_I2
Output Capacitance (DO, CAS = V_IH to disable output)
C_O
Note 6. Effective capacitance calculated from the equation:
C = ^{I • ∆t} with ∆V = 3V or measured with Boonton meter.
∆V
Min Typ Max Unit
– – 6 pF
– – 7 pF
– – 7 pF
AC Test Conditions:
Input Pulse Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 3.0V
Input Rise and Fall Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5ns between 0.8 and 2.4V
Input Timing Reference Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 2.4V
Output Timing Reference Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 to 2.4V
Output Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . equivelent to 2 standard TTL loads and 100pf