SANYO LE28CV1001T-12, LE28CV1001M-15, LE28CV1001M-12, LE28CV1001T-15 Datasheet

CMOS LSI

Ordering number : EN*5409

93096HA (OT) No. 5409-1/14

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

1MEG (131072 words × 8 bits) Flash Memory

LE28CV1001M, T-12/15

Overview

The LE28CV1001M, T Series ICs are 1 MEG flash memory products that feature a 131072-word × 8-bit organization and 3.3 V single-voltage power supply operation. CMOS peripheral circuits are adopted for high speed, low power, and ease of use. A 128-byte page rewrite function provides rapid data rewriting.

Features

• Highly reliable 2-layer polysilicon CMOS flash EEPROM process

• Read and write operations using a 5 V single-voltage power supply

• Fast access time: 120 and 150 ns

• Low power dissipation — Operating current (read): 12 mA (maximum) — Standby current: 15 µA (maximum)

• Highly reliable read/write —Erase/write cycles: 104/103cycles —Data retention time: 10 years

• Address and data latches

• Fast page rewrite operation — 128 bytes per page — Byte/page rewrite time: 5 ms (typical) — Chip rewrite time: 5 s (typical)

• Automatic rewriting using internally generated Vpp

• Rewrite complete detection function — Toggle bit — Data polling

• Hardware and software data protection functions

• All inputs and outputs are TTL compatible.

• Pin assignment conforms to the JEDEC byte-wide EEPROM standard.

• Package SOP 32-pin (525 mil) plastic package:LE28CV1001M TSOP 32-pin (8 × 20 mm) plastic package:LE28CV1001T

Package Dimensions

unit: mm

3205-SOP32

unit: mm

3224-TSOP32

SANYO: TSOP32 (TYPE-I)

[LE28CV1001T]

These FLASH MEMORY products incorporate technology licensed Silicon Storage Technology, Inc.

[LE28CV1001M]

SANYO: SOP32

Block Diagram

Pin Assignments

Pin Functions

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LE28CV1001M, T-12/15

Symbol Pin Function

A16 to A0 Address input

Supply the memory address to these pins. The address is latched internally during a write cycle.

These pins output data during a read cycle and input data during a write cycle.

DQ7 to DQ0 Data input and output Data is latched internally during a write cycle.

Outputs go to the high-impedance state when either OE or CE is high.

CE Chip enable

The device is active when CE is low. When CE is high, the device becomes unselected and goes to the standby state.

OE Output enable

Makes the data output buffers active. OE is a low-active input.

WE Write enable

Makes the write operation active. WE is an active-low input.

Power supply Apply 3.3 V ±0.3 to this pin.

Ground

N.C. No connection These pins must be left open.

Function Logic

Software Data Protection Command

Note: Address format A14 to A0 (hex.)

Software Product ID Entry Command and Exit Command Codes

Notes on software Product ID Command Code:

1. Command Code Address format: A14 to A0 (hex.)

2. With A14 to A1 = V

Manufacturer Code is read with A0 = V

to be BFH

LE28CV1001M, T Device Code is read with A0 = V

to be 07H

3. The device does not remain in Software Product ID Mode if powered down.

4. A16 and A15 at V

or VIL.

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LE28CV1001M, T-12/15

Mode CE OE WE A16 to A0 DQ7 to DQ0

Read V

VIHA

OUT

Write V

VILA

Standby V

X X X High-Z

Write inhibit

X V

X X High-Z/D

OUT

X X VIHX High-Z/D

OUT

A16 to A10 = VIL, A8 to A1 = VIL,

Manufacturer code (BF)

Product identification V

A9 = 12 V, A0 = V

A16 to A10 = VIL, A8 to A1 = VIL,

Device code (07)

A9 = 12 V, A0 = V

Byte sequence

Set protection Reset protection

Address Data Address Data Write 0 5555 AA 5555 AA Write 1 2AAA 55 2AAA 55 Write 2 5555 A0 5555 80 Write 3 5555 AA Write 4 2AAA 55 Write 5 5555 20

Byte sequence

Protect ID Entry Protect ID Exit

Address Data Address Data Write 0 5555 AA 5555 AA Write 1 2AAA 55 2AAA 55 Write 2 5555 80 5555 F0 Write 3 5555 AA Write 4 2AAA 55 Write 5 5555 60

Device Operation

This Sanyo 1 MEG flash memory allows electrical rewrites using a 3.3 V single-voltage power supply. The LE28CV1001M, T series products are pin and function compatible with the industry standards for this type of product.

Read

The LE28CV1001M, T series products read operations are controlled by CE and OE. The host must set both pins to the low level to acquire the output data. CE is used for chip selection. When CE is at the high level, the chip will be in the unselected state and only draw the standby current. OE is used for output control. The output pins go to the highimpedance state when either CE or OE is high. See the timing waveforms (Figure 1) for details.

Page Write Operation

The write operation starts when both CE and WE are at the low level, and furthermore OE is at the high level. The write operation is executed in two stages. The first stage is a byte load cycle in which the host writes to the LE28CV1001M, T series products internal page buffer. The second stage is an internal programming cycle in which the data in the page buffer is written to the nonvolatile memory cell array. In the byte load cycle, the address is latched on the falling edge of either CE or WE, whichever occurs later. The input data is latched on the rising edge of either CE or WE, whichever occurs first. The internal programming cycle starts if either WE or CE remains high for 200 µs (t

BLCO

). Once this programming cycle starts, the operation continues until the programming operation is completely done. This operation executes within 5 ms (typical). Figures 2 and 3 show the WE and CE control write cycle timing diagrams, and Figure 9 shows the flowchart for this operation. In the page write operation, 128 bytes of data can be written to the LE28CV1001M, T series products internal page buffer before the internal programming cycle. All the data in the page buffer is written to the memory cell array during the 5 ms (typical) internal programming cycle. Therefore the LE28CV1001M, T series products page write function can rewrite all memory cells in 5 seconds (typical). The host can perform any other activities desired, such as moving data at other locations within the system and preparing the data required for the next page write, during the period prior to the completion of the internal programming cycle. In a given page write operation, all the data bytes loaded into the page buffer must be for the same page address specified by address lines A7 through A16. All data that was not explicitly loaded into the page buffer is set to FFH. Figure 2 shows the page write cycle timing diagram. If the host loads the second data byte into the page buffer within the 100 µs byte load cycle time (t

BLC

) after the first byte load cycle the LE28CV1001M, T series products stop in the page load cycle thus allowing data to be loaded continuously. The page load cycle terminates if additional data is not loaded into the internal page buffer within 200 µs (t

BLCO

) after the previous byte load cycle, as in the case where WE does not switch from high to low after the last WE rising edge. The data in the page buffer can be rewritten in the next byte load cycle. The page load period can continue indefinitely as long as the host continues to load data into the device within the 100 µs byte load cycle. The page that is loaded is determined by the page address of the last byte loaded.

Detecting the Write Operation State

The LE28CV1001M, T series products provide two functions for detecting the completion of the write cycle. These functions are used to optimize the system write cycle time. These functions are based on detecting the states of the Data polling bit (DQ7) and the toggle bit (DQ6).

Data Polling (DQ7)

The LE28CV1001M, T series products output to DQ7 the inverse of the last data loaded during the page and byte load cycles when the internal programming cycle is in progress. The last data loaded will be read from DQ7 when the internal programming cycle completes. Figure 4 shows the Data polling cycle timing diagram and Figure 10 shows the flowchart for this operation.

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Toggle Bit (DQ6)

Data values of 0 and 1 are output alternately for DQ6, that is DQ6 is toggled between 0 and 1, during the internal programming cycle. When the internal programming cycle completes this toggling is stopped and the device becomes ready to execute the next operation. Figure 5 shows the toggle bit timing diagram and Figure 10 shows the flowchart for this operation.

Data Protection Hardware Data Protection

Noise and glitch protection: The LE28CV1001 does not execute write operations for WE or OE pulses that are 15 ns or shorter. Power (VDD) on and cutoff detection: The programming operation is disabled when VDDis 2.5 V or lower. Write inhibit mode: Writing is disabled when OE is low and either CE is high or WE is high. Use this function to prevent writes from occurring when the power is being turned on or off.

Software Data Protection

The LE28CV1001 implements the optional software data protection function recognized by JEDEC. This function requires that a 3-byte load operation to be performed before a write operation data load. The 3-byte load sequence starts a page load cycle without activating any write operation. Thus this is an optimal protection scheme for unintended write cycles triggered by noise associated with powering the chip on or off. Note that the LE28CV1001 is shipped with the software data protection function disabled. The software data protection circuit is activated by executing a 3-byte byte load cycle in advance of the data sequence in the page load cycle. (See Figure 6.) This causes the device to automatically enter data protection mode. After this, write operations require a 3-byte byte load cycle to be executed in advance. A 6-byte write sequence is required to switch the device out of this protection mode. Figure 7 shows the timing diagram. If a write operation is attempted in software protection mode, all device functions are disabled for 200 µs. Figure 11 shows the flowchart for this operation.

Product Identification

The device identification code is used for recognizing the device and its manufacturer. This mode can be used by hardware and software. The hardware operating mode is used to recognize algorithms that match the device when an external programming unit is used. Also, user systems can recognize the product number using software product identification mode. Figure 12 shows the flowchart for this operation. The manufacturer and device codes are the same in both modes.

No. 5409-5/14

LE28CV1001M, T-12/15

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