MXIC MX27L512PC-12, MX27L512PC-15, MX27L512PC-20, MX27L512PC-25, MX27L512PI-12 Datasheet

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FEATURES

MX27L512

512K-BIT [64K x 8] CMOS EPROM

• 64K x 8 organization

• Wide voltage range, 2.7V to 3.6V

• +12.5V programming voltage

• Fast access time: 120/150/200/250ns

• Totally static operation

• Completely TTL compatible

GENERAL DESCRIPTION

The MX27L512 is a 3V only, 512K-bit, ultraviolet Erasable Programmable Read Only Memory. It is organized as 64K words by 8 bits per word, operates from a single +3volt supply, has a static standby mode, and features fast single address location programming. All programming signals are TTL levels, requiring a single pulse. For programming outside from the system, existing EPROM

PIN CONFIGURATIONS

PDIP

A15 A12

A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2

GND

1 2 3 4 5 6 7 8 9 10 11 12 13 14

28 27 26 25 24 23 22 21 20

MX27L512

19 18 17 16 15

VCC A14 A13 A8 A9 A11 OE/VPP A10 CE Q7 Q6 Q5 Q4 Q3

PLCC

A12

A6 A5 A4 A3

A2 A1

A0 NC Q0

MX27L512

14 17 20

A15NCVCC

Q3Q4Q5

GND

A14

A13

• Operating current: 10mA@ 3.6V, 5MHz

• Standby current: 10uA

• Package type:

- 28 pin plastic DIP

- 32 pin PLCC

- 28 pin 8 x 13.4 mm TSOP(I)

programmers may be used. The MX27L512 supports intelligent fast programming algorithm which can result in programming time of less than fifteen seconds.

This EPROM is packaged in industry standard 28 pin dual-in-line packages , 32 lead PLCC, and 28 lead TSOP(I) packages.

BLOCK DIAGRAM

A8 A9 A11 NC OE/VPP A10 CE Q7 Q6

OE/VPP

A0~A15

ADDRESS

INPUTS

VCC GND

. . . . . . . .

CONTROL

LOGIC

Y-DECODER

X-DECODER

OUTPUT

BUFFERS

Y-SELECT

. . .

512K BIT

CELL

MAXTRIX

. .

Q0~Q7

8 x 13.4mm 28TSOP(I)

A11

A13 A14

A15 A12

22 23 24

26 27 28 1 2 3

OE/VPP

VCC

P/N: PM0256

MX27L512

PIN DESCRIPTION

A10

GND

SYMBOL PIN NAME

A0~A15 Address Input Q0~Q7 Data Input/Output CE Chip Enable Input OE/VPP Output Enable Input/Program Supply Voltage NC No Internal Connection VCC Power Supply Pin GND Ground Pin

REV. 2.3, SEP. 19, 2001

MX27L512

FUNCTIONAL DESCRIPTION

THE PROGRAMMING OF THE MX27L512

When the MX27L512 is delivered, or it is erased, the chip has all 512K bits in the "ONE", or HIGH state. "ZEROs" are loaded into the MX27L512 through the procedure of programming.

For programming, the data to be programmed is applied with 8 bits in parallel to the data pins.

Vcc must be applied simultaneously or before Vpp, and removed simultaneously or after Vpp. When programming an MXIC EPROM, a 0.1uF capacitor is required across Vpp and ground to suppress spurious voltage transients which may damage the device.

FAST PROGRAMMING

The device is set up in the fast programming mode when the programming voltage OE/VPP = 12.75V is applied, with VCC = 6.25 V, (Algorithm is shown in Figure 1). The programming is achieved by applying a single TTL low level 100us pulse to the CE input after addresses and data line are stable. If the data is not verified, an additional pulse is applied for a maximum of 25 pulses. This process is repeated while sequencing through each address of the device. When the programming mode is completed, the data in all address is verified at VCC = 5V ± 10%.

PROGRAM INHIBIT MODE

Programming of multiple MX27L512s in parallel with different data is also easily accomplished by using the Program Inhibit Mode. Except for CE and OE, all like inputs of the parallel MX27L512 may be common. A TTL low-level program pulse applied to an MX27L512 CE input with OE/VPP = 12.5 ± 0.5V will program that MX27L512. A high-level CE input inhibits the other MX27L512s from being programmed.

PROGRAM VERIFY MODE

Verification should be performed on the programmed bits to determine that they were correctly programmed. The verification should be performed with OE/VPP and CE, at VIL. Data should be verified tDV after the falling edge of CE.

AUTO IDENTIFY MODE

The auto identify mode allows the reading out of a binary code from an EPROM that will identify its manufacturer and device type. This mode is intended for use by programming equipment for the purpose of automatically matching the device to be programmed with its corresponding programming algorithm. This mode is functional in the 25°C ± 5°C ambient temperature range that is required when programming the MX27L512.

To activate this mode, the programming equipment must force 12.0 ± 0.5(VH) on address line A9 of the device. Two identifier bytes may then be sequenced from the device outputs by toggling address line A0 from VIL to VIH. All other address lines must be held at VIL during auto identify mode.

Byte 0 ( A0 = VIL) represents the manufacturer code, and byte 1 (A0 = VIH), the device identifier code. For the MX27L512, these two identifier bytes are given in the Mode Select Table. All identifiers for manufacturer and device codes will possess odd parity, with the MSB (Q7) defined as the parity bit.

READ MODE

The MX27L512 has two control functions, both of which must be logically satisfied in order to obtain data at the outputs. Chip Enable (CE) is the power control and should be used for device selection. Output Enable (OE) is the output control and should be used to gate data to the output pins, independent of device selection. Assuming that addresses are stable, address access time (tACC) is equal to the delay from CE to output (tCE). Data is available at the outputs tOE after the falling edge of OE, assuming that CE has been LOW and addresses have been stable for at least tACC - tOE.

STANDBY MODE

The MX27L512 has a CMOS standby mode which reduces the maximum VCC current to 10 uA. It is placed in CMOS standby when CE is at VCC ± 0.3 V. The MX27L512 also has a TTL-standby mode which reduces the maximum VCC current to 0.25 mA. It is placed in TTL-standby when CE is at VIH. When in standby mode, the outputs are in a high-impedance state, independent of the OE input.

P/N:PM0256

REV. 2.3, SEP. 19, 2001

MX27L512

TWO-LINE OUTPUT CONTROL FUNCTION

To accommodate multiple memory connections, a twoline control function is provided to allow for:

SYSTEM CONSIDERATIONS

During the switch between active and standby conditions, transient current peaks are produced on the rising and falling edges of Chip Enable. The magnitude

1. Low memory power dissipation,

2. Assurance that output bus contention will not occur.

of these transient current peaks is dependent on the output capacitance loading of the device. At a minimum, a 0.1 uF ceramic capacitor (high frequency, low inherent inductance) should be used on each device between

It is recommended that CE be decoded and used as the primary device-selecting function, while OE be made a common connection to all devices in the array and connected to the READ line from the system control bus. This assures that all deselected memory devices are in their low-power standby mode and that the output pins are only active when data is desired from a particular

VCC and GND to minimize transient effects. In addition, to overcome the voltage drop caused by the inductive effects of the printed circuit board traces on EPROM arrays, a 4.7 uF bulk electrolytic capacitor should be used between VCC and GND for each eight devices. The location of the capacitor should be close to where the power supply is connected to the array.

memory device.

MODE SELECT TABLE

PINS

MODE CE OE/VPP A0 A9 OUTPUTS

Read VIL VIL X X DOUT Output Disable VIL VIH X X High Z Standby (TTL) VIH X X X High Z Standby (CMOS) VCC±0.3V X X X High Z Program VIL VPP X X DIN Program Verify VIL VIL X X DOUT Program Inhibit VIH VPP X X High Z Manufacturer Code(3) VIL VIL VIL VH C2H Device Code(3) VIL VIL V IH VH 91H

NOTES: 1. VH = 12.0 V ± 0.5 V

2. X = Either VIH or VIL

P/N:PM0256

3. A1 - A8 = A10 - A15 = VIL(For auto select)

4. See DC Programming Characteristics for VPP voltage during programming.

REV. 2.3, SEP. 19, 2001

Figure1. FAST PROGRAMMING FLOW CHART

ADDRESS = FIRST LOCATION

PROGRAM ONE 100us PULSE

START

VCC = 6.25V

OE/VPP = 12.75V

MX27L512

INCREMENT ADDRESS

LAST

ADDRESS ?

YES

PASS

ADDRESS = FIRST LOCATION

PROGRAM ONE 100us PULSE

LAST

ADDRESS ?

X = 0

VERIFY BYTE

VCC = 5.25V

OE/VPP = VIL

COMPARE

ALL BYTES

TO ORIGINAL

DATA

DEVICE PASSED

YES

PASS

FAIL

INCREMENT X

X = 25 ?

YES

DEVICE FAILED

P/N:PM0256

REV. 2.3, SEP. 19, 2001

SWITCHING TEST CIRCUITS

MX27L512

DEVICE UNDER

TEST

CL = 100 pF including jig capacitance

SWITCHING TEST WAVEFORMS

AC driving levels

AC TESTING: AC driving levels are 2.4V/0.4V for both commercial grade and industrial grade.

6.2K ohm

2.0V TEST POINTS

0.8V

INPUT

Input pulse rise and fall times are < 10ns.

1.8K ohm +5V

DIODES = IN3064 OR EQUIVALENT

2.0V

0.8V OUTPUT

P/N:PM0256

REV. 2.3, SEP. 19, 2001

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