HMNR1288DV-70I datasheet(8/14 Pages) HANBIT

Part #	HMNR1288DV-70I

Description	5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER NVSRAM

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Manufacturer	HANBIT [Hanbit Electronics Co.,Ltd]

Direct Link	http://www.hbe.co.kr

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HANBit

HMNR1288D(V)

URL : www.hbe.co.kr

8

HANBit Electronics Co.,Ltd

Rev. 1.0 (April, 2002)

Data Retention Mode

With valid VCC applied, the HMNR1288D(V) operates as a conventional Bytewide static RAM. Should the supply voltage

decay, the RAM will automatically deselect, write protecting itself when VCC falls between VPFD (max), VPFD (min) window.

All outputs become high impedance and all inputs are treated as “Don't care.”

Note : A power failure during a WRITE cycle may corrupt data at the current addressed location, but does not jeopardize

the rest of the RAM's content. At voltages below VPFD (min), the memory will be in a write protected state, provided the VCC

fall time is not less than tF. The HMNR1288D(V) may respond to transient noise spikes on VCC that cross into the deselect

window during the time the device is sampling VCC. Therefore, decoupling of the power supply lines is recommended.

When VCC drops below VSO, the control circuit switches power to the internal battery, preserving data and powering the

clock. The internal energy source will maintain data in the HMNR1288D(V) for an accumulated period of at least 10 years

at room temperature. As system power rises above VSO, the battery is disconnected, and the power supply is switched to

external VCC . Write protection continues until VCC reaches VPFD (min) plus tREC (min). Normal RAM operation can resume

tREC after VCC exceeds VPFD (max).

Figure 5. Power Down/Up Mode AC Waveforms

Power Down/Up AC Characteristics

Symbol

Parameter

Min

Max

Unit

tF

(2)

VPFD (max) to VPFD (min) VCC Fall Time

300

uS

HMNR1288D

10

uS

tFB

(3)

VPFD (min) to VSS VCC Fall Time

HMNR1288DV

150

uS

tR

VPFD (min) to VPFD (max) VCC Rise Time

10

uS

tREC

(4)

VPFD (max) to RST High

40

200

uS

tRB

VSS to VPFD (min) VCC Rise Time

5

uS

Note :

1. Valid for Ambient Operating Temperature: TA = 0 to 70° C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).

2. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200 µs after

VCC passes VPFD (min).

3. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.

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