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HMNP16MM: DescriptionNon-Volatile SRAM MODULE 16Mbyte (4,096K x 32Bit), PCI interface, (SMM) 5V; File Size316KB，13 Pages; ManufacturerHANBIT Electronics; Websitehttp://www.hbe.co.kr/

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Non-Volatile SRAM MODULE 16Mbyte (4,096K x 32Bit), PCI interface, (SMM) 5V

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HANBit

HMNP16MM

Non-Volatile SRAM MODULE 16Mbyte (4,096K x 32Bit), PCI interface, (SMM) 5V

Part No.

HMNP16MM

GENERAL DESCRIPTION

The HMNP16MM Nonvolatile SRAM is a 16,777,216-byte static RAM organized as 8,388,608 words by 16 bits.

The HMNP16MM has a self-contained lithium energy source provide reliable non-volatility coupled with the

unlimited write cycles of standard SRAM and integral control circuitry which constantly monitors the single 5V

supply for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is

automatically switched on to sustain the memory until after V

returns valid and write protection is

unconditionally enabled to prevent garbled data.

In addition the SRAM is unconditionally write-protected to prevent an inadvertent write operation. At this time

the integral energy source is switched on to sustain the memory until after V

returns valid.

The HMNP16MM uses extremely low standby current CMOS SRAM’s, coupled with small lithium coin cells to

provide non-volatility without long write-cycle times and the write-cycle limitations associated with EEPROM.

FEATURES

Access time : 70, 85 and 100ns

High-density design : 16Mbyte Design

Battery internally isolated until power is applied

Unlimited write cycles

Data retention in the absence of V

10-years minimum data retention in absence of power

Automatic write-protection during power-up/power-down cycles

Data is automatically protected during power loss

Industrial temperature operation

OPTIONS

Timing

70 ns

85 ns

100 ns

MARKING

- 70

- 85

-100

URL : www.hbe.co.kr

Rev. 0.0 (April, 2002)

HANBit Electronics Co.,Ltd

HANBit

FUNCTIONAL DESCRIPTION

HMNP16MM

The HMNP16MM executes a read cycle whenever /WE is inactive(high) and /CE is active(low). The address

specified by the address inputs(A

-A

) defines which of the 16,777,216 bytes of data is accessed. Valid data

will be available to the eight data output drivers within t

ACC

(access time) after the last address input signal is

stable.

When power is valid, the HMNP16MM operates as a standard CMOS SRAM. During power-down and power-

up cycles, the HMNP16MM acts as a nonvolatile memory, automatically protecting and preserving the memory

contents.

The HMNP16MM is in the write mode whenever the /WE and /CE signals are in the active (low) state after

address inputs are stable. The later occurring falling edge of /CE or /WE will determine the start of the write

cycle. The write cycle is terminated by the earlier rising edge of /CE or /WE. All address inputs must be kept

valid throughout the write cycle. /WE must return to the high state for a minimum recovery time (t

) before

another cycle can be initiated. The /OE control signal should be kept inactive (high) during write cycles to avoid

bus contention. However, if the output bus been enabled (/CE and /OE active) then /WE will disable the

outputs in t

ODW

from its falling edge.

The HMNP16MM provides full functional capability for Vcc greater than 4.5 V and write protects by 4.37 V

nominal. Power-down/power-up control circuitry constantly monitors the Vcc supply for a power-fail-detect

threshold V

PFD

. When V

falls below the V

PFD

threshold, the SRAM automatically write-protects the data. All

inputs to the RAM become

“don’t

care” and all outputs are high impedance. As Vcc falls below approximately

3 V, the power switching circuit connects the lithium energy source to RAM to retain data. During power-up,

when Vcc rises above approximately 3.0 volts, the power switching circuit connects external Vcc to the RAM

and disconnects the lithium energy source. Normal RAM operation can resume after Vcc exceeds 4.5 volts.

URL : www.hbe.co.kr

Rev. 0.0 (April, 2002)

HANBit Electronics Co.,Ltd

HMNP16MM Related Products

	HMNP16MM	HMNP16MM-100
Description	Non-Volatile SRAM MODULE 16Mbyte (4,096K x 32Bit), PCI interface, (SMM) 5V	Non-Volatile SRAM MODULE 16Mbyte (4,096K x 32Bit), PCI interface, (SMM) 5V

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