NTE21256 データシートの表示（PDF） - NTE Electronics

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NTE21256

262,144–Bit Dynamic Random Access Memory (DRAM)

NTE Electronics 

DC Characteristics: (TA = 0° to +70°C, VSS = 0V, VCC = +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 VCC Supply Current

Standby VCC Supply Current

Average VCC Supply Current during

RAS–only refresh cycles

VIH Notes 2, Note3

VIL Notes 2, Note3

VOH Note 4

VOL Note 5

ICC1 tRC = 260ns, Note 6

ICC2 Note 7

ICC3 Note 6

2.4 – VCC +1 V

–1.0 –

0.8

V

2.4 –

–

V

––

0.4

V

––

70 mA

––

5 mA

––

65 mA

Average VCC supply Current during

Page Mode

ICC4 Note 6

––

55 mA

Input Leakage Current (Any Input)

Output Leakage Current

Supply Voltage

II (L)

––

IO (L) CAS at Logic 1, 0 ≤ V out ≤ 5.5 – –

VCC Note 2

4.5 –

VSS

0–

10 µA

10 µA

5.5 V

0

V

Note 2. All voltages referenced to VSS.

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. IOH = 4mA and 100pf load.

Note 5. IOL = 4mA and 100pf load.

Note 6. ICC depends on frequency of operation. Maximum current is measured at the fastest cycle

rate.

Note 7. RAS and CAS are both at VIH.

Capacitance: (Note 6)

Parameter

Symbol Test Conditions

Input Capacitance (A0–A8, DI)

CI1

Input Capacitance (RAS, CAS, WE)

CI2

Output Capacitance (DO, CAS = VIH to disable output)

CO

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

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