MXIC MX27C4000AMC-10, MX27C4000AMC-12, MX27C4000AMC-15, MX27C4000AMC-90, MX27C4000AMI-10 Datasheet

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FEATURES

512K x 8 organization

Single +5V power supply

+12.5V programming voltage

Fast access time: 90/100/120/150 ns

Totally static operation

Completely TTL compatible

GENERAL DESCRIPTION

The MX27C4000A is a 5V only, 4M-bit, One Time Programmable Read Only Memory. It is organized as 512K words by 8 bits per word, operates from a single +5 volt 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 32 PDIP/SOP

VPP

1

 

32

VCC

A16

2

 

31

A18

A15

3

 

30

A17

A12

4

 

29

A14

A7

5

MX27C4000A

28

A13

A6

6

27

A8

 

A5

7

 

26

A9

A4

8

 

25

A11

A3

9

 

24

OE

 

A2

10

 

23

A10

A1

11

 

22

CE

 

A0

12

 

21

Q7

Q0

13

 

20

Q6

Q1

14

 

19

Q5

Q2

15

 

18

Q4

GND

16

 

17

Q3

PRELIMINARY

MX27C4000A

4M-BIT [512K x8] CMOS OTP ROM

Operating current: 40mA

Standby current: 100uA

Package type:

-32 pin PDIP

-32 pin PLCC

-32 pin SOP

-32 pin TSOP

programmers may be used. The MX27C4000A supports a intelligent fast programming algorithm which can result in programming time of less than two minutes.

This One Time Programmable Read Only Memory is packaged in industry standard 32 pin dual-in-line plastic, 32 lead PLCC, 32 lead SOP, 32 lead TSOP packages.

32 PLCC

 

A12

A15

A16

VPP

VCC

A18

A17

 

 

 

4

 

 

1

32

 

30

A14

A7

5

 

 

 

 

 

29

A6

 

 

 

 

 

 

 

A13

A5

 

 

 

 

 

 

 

A8

A4

 

 

 

 

 

 

 

A9

A3

9

MX27C4000A

25

A11

 

 

 

 

 

 

 

 

 

 

A2

 

 

 

 

 

 

 

OE

A1

 

 

 

 

 

 

 

A10

 

 

 

 

 

 

 

 

 

 

A0

 

 

 

 

 

 

 

CE

Q0

13

 

 

17

 

 

21

Q7

 

14

 

 

 

 

20

 

 

 

Q1

Q2

GND

Q3

Q4

Q5

Q6

 

 

32 TSOP

 

 

 

 

32

 

 

 

 

A11

 

1

 

 

OE

A9

 

2

 

31

 

A10

 

 

 

 

30

 

 

 

 

A8

 

3

 

 

CE

A13

 

4

 

29

 

Q7

A14

 

5

 

28

 

Q6

A17

 

6

 

27

 

Q5

A18

 

7

 

26

 

Q4

VCC

 

8

MX27C4000A

25

 

Q3

VPP

 

9

24

 

GND

A16

 

10

 

23

 

Q2

A15

 

11

 

22

 

Q1

A12

 

12

 

21

 

Q0

 

 

 

A7

 

13

 

20

 

A0

 

 

 

A6

 

14

 

19

 

A1

 

 

 

A5

 

15

 

18

 

A2

 

 

 

A4

 

16

 

17

 

A3

 

 

 

 

 

 

 

 

 

 

 

 

PIN DESCRIPTION

SYMBOL

PIN NAME

A0~A18

Address Input

 

 

 

 

 

 

Q0~Q7

Data Input/Output

 

 

 

 

 

 

 

 

 

Chip Enable Input

 

CE

 

 

 

 

 

 

 

 

 

Output Enable Input

 

OE

 

 

 

 

 

 

 

VPP

Program Supply Voltage

 

 

 

 

 

 

VCC

Power Supply Pin (+5V)

 

 

 

 

 

 

GND

Ground Pin

 

 

 

 

 

 

P/N: PM00694

1

REV. 1.6, JUL. 19, 2001

 

MX27C4000A

BLOCK DIAGRAM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CE

 

 

 

 

CONTROL

 

 

OUTPUT

 

 

 

 

Q0~Q7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOGIC

 

 

BUFFERS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

Y-DECODER

.

Y-SELECT

 

 

 

 

 

 

 

 

 

.

 

 

 

 

 

.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A0~A18

 

 

.

 

 

 

 

 

.

 

 

 

 

 

 

 

 

 

.

 

 

 

 

 

.

4M BIT

 

 

 

 

 

 

ADDRESS

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

 

 

.

 

 

 

 

 

 

 

 

X-DECODER

CELL

 

 

 

 

 

 

INPUTS

 

 

 

 

 

 

 

 

 

 

.

 

 

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MAXTRIX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

 

 

 

 

 

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VCC

VSS

FUNCTIONAL DESCRIPTION

THE PROGRAMMING OF THE MX27C4000A

When the MX27C4000A is delivered, or it is erased, the chip has all 4M bits in the "ONE" or HIGH state. "ZEROs" are loaded into the MX27C4000A 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 OTP ROM, a 01uF 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 VPP = 12.75V is applied, with VCC = 6.25 V and OE = VIH (Algorithm is shown in Figure 1). The programming is achieved by applying a single TTL low level 10us 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 = VPP = 5V ± 10%.

PROGRAM INHIBIT MODE

Programming of multiple MX27C4000As 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 MX27C4000A may be common. A TTL low-level program pulse applied to an

MX27C4000A CE input with VPP = 12.5 ±0.5 V and CE LOW will program that MX27C4000A. A high-level CE input inhibits the other MX27C4000As 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 and CE at VIL, and VPP at its programming voltage.

AUTO IDENTIFY MODE

The auto identify mode allows the reading out of a binary code from an OTP ROM 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 MX27C4000A.

To activate this mode, the programming equipment must force 12.0 ±0.5 V 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 MX27C4000A, 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 MX27C4000A has two control functions, both of which must be logically satisfied in order to obtain data

P/N: PM00694

REV. 1.6, JUL. 19, 2001

2

MX27C4000A

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's, assuming that CE has been LOW and addresses have been stable for at least tACC - tOE.

STANDBY MODE

The MX27C4000A has a CMOS standby mode which reduces the maximum VCC current to 100 uA. It is placed in CMOS standby when CE is at VCC ± 0.3 V. The MX27C4000A also has a TTL-standby mode which reduces the maximum VCC current to 1.5 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.

TWO-LINE OUTPUT CONTROL FUNCTION

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

1. Low memory power dissipation,

MODE SELECT TABLE

2. Assurance that output bus contention will not occur.

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 memory device.

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 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 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.

 

 

 

 

 

 

PINS

 

 

 

 

 

 

 

 

 

 

 

MODE

CE

 

OE

A0

A9

VPP

OUTPUTS

 

 

 

 

 

 

 

 

 

Read

VIL

VIL

X

X

VCC

DOUT

 

 

 

 

 

 

 

 

 

Output Disable

VIL

VIH

X

X

VCC

High Z

 

 

 

 

 

 

 

 

 

Standby (TTL)

VIH

X

X

X

VCC

High Z

 

 

 

 

 

 

 

 

 

Standby (CMOS)

VCC±0.3V

X

X

X

VCC

High Z

 

 

 

 

 

 

 

 

 

Program

VIL

VIH

X

X

VPP

DIN

 

 

 

 

 

 

 

 

 

Program Verify

VIH

VIL

X

X

VPP

DOUT

 

 

 

 

 

 

 

 

 

Program Inhibit

VIH

VIH

X

X

VPP

High Z

 

 

 

 

 

 

 

 

 

Manufacturer Code(3)

VIL

VIL

VIL

VH

VCC

C2H

 

 

 

 

 

 

 

 

 

Device Code(3)

VIL

VIL

VIH

VH

VCC

C0H

 

 

 

 

 

 

 

 

 

NOTES:

 

 

 

 

 

 

 

 

1.VH = 12.0 V ± 0.5 V

2.X = Either VIH or VIL

3.A1 - A8 = A10 - A18 = VIL(For auto select)

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

P/N: PM00694

REV. 1.6, JUL. 19, 2001

3

MXIC MX27C4000AMC-10, MX27C4000AMC-12, MX27C4000AMC-15, MX27C4000AMC-90, MX27C4000AMI-10 Datasheet

MX27C4000A

FIGURE 1. FAST PROGRAMMING FLOWCHART

 

 

START

 

 

 

ADDRESS = FIRST LOCATION

 

 

 

VCC = 6.25V

 

 

 

VPP = 12.75V

 

 

 

X = 0

 

 

 

PROGRAM ONE 10us PULSE

 

INTERACTIVE

 

INCREMENT X

 

SECTION

 

 

 

 

 

X = 25?

YES

 

 

 

 

 

NO

 

 

 

FAIL

 

 

 

VERIFY BYTE

 

 

 

?

 

 

 

PASS

 

 

 

NO

 

 

INCREMENT ADDRESS

LAST ADDRESS

 

 

 

 

 

 

 

FAIL

 

 

YES

 

 

 

VCC = VPP = 5.25V

 

VERIFY SECTION

 

 

FAIL

 

 

VERIFY ALL BYTES

 

 

DEVICE FAILED

 

 

?

 

 

 

PASS

 

 

 

DEVICE PASSED

 

P/N: PM00694

 

4

REV. 1.6, JUL. 19, 2001

 

 

 

MX27C4000A

SWITCHING TEST CIRCUITS

DEVICE

1.8K ohm

UNDER

+5V

 

TEST

 

CL

DIODES = IN3064

OR EQUIVALENT

6.2K ohm

CL = 100 pF including jig capacitance

SWITCHING TEST WAVEFORMS

2.0V

2.0V

AC driving levels

TEST POINTS

0.8V

0.8V

INPUT

OUTPUT

AC TESTING: (1) AC driving levels are 2.4V/0.4V.

(2) Input pulse rise and fall times are < 10ns.

P/N: PM00694

REV. 1.6, JUL. 19, 2001

5

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