MXIC MX27C8000MC-10, MX27C8000MC-12, MX27C8000MC-15, MX27C8000PC-10, MX27C8000PC-12 Datasheet

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FEATURES

MX27C8000

8M-BIT [1M x8] CMOS EPROM

• 1M x 8 organization

• Single +5V power supply

• +12.5V programming voltage

• Fast access time: 100/120/150 ns

• Totally static operation

• Completely TTL compatible

GENERAL DESCRIPTION

The MX27C8000 is a 5V only, 8M-bit, One Time Programmable Read Only Memory. It is organized as 1M 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

A19 A16 A15 A12

GND

A7 A6 A5 A4 A3 A2 A1 A0 Q0 Q1 Q2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

32 31 30 29 28 27 26 25 24 23

MX27C8000

22 21 20 19 18 17

BLOCK DIAGRAM

VCC A18 A17 A14 A13 A8 A9 A11 OE/VPP A10 CE Q7 Q6 Q5 Q4 Q3

32 PLCC

A12

A15

A7 A6 A5 A4

A3 A2 A1 A0 Q0

MX27C8000

14 17 20

A16

GND

A19

VCC

Q3Q4Q5

A18

A17

• Operating current: 60mA

• Standby current: 100uA

• Package type:

- 32 pin plastic DIP

- 32 pin PLCC/SOP

- 32 pin TSOP

programmers may be used. The MX27C8000 supports a intelligent fast programming algorithm which can result in programming time of less than two minutes.

This EPROM is packaged in industry standard 32 pin dual-in-line packages, 32 lead PLCC, 32 lead TSOP and 32 lead SOP packages.

32 TSOP

A11

3 A13 A14 A17 A18

VCC

A19 A16 A15 A12

MX27C8000

A14 A13 A8 A9 A11 OE/VPP A10 CE Q7

PIN DESCRIPTION

OE/VPP

A10

GND

OE/VPP

A0~A19

ADDRESS

INPUTS

VCC GND

P/N: PM00259

. . . . . . . .

CONTROL

LOGIC

Y-DECODER

X-DECODER

OUTPUT

BUFFERS

Q0~Q7

SYMBOL PIN NAME

A0~A19 Address Input Q0~Q7 Data Input/Output

Y-SELECT

. . .

8M BIT

. . . .

CELL

MAXTRIX

CE Chip Enable Input OE/VPP Output Enable Input/Program Supply Voltage VCC Power Supply Pin (+5V) GN D Ground Pin

REV. 3.5, AUG. 20, 2001

MX27C8000

FUNCTIONAL DESCRIPTION

THE PROGRAMMING OF THE MX27C8000

When the MX27C8000 is delivered, or it is erased, the chip has all 8M bits in the "ONE" or HIGH state. "ZEROs" are loaded into the MX27C8000 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 50us 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 MX27C8000s 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 MX27C8000 may be common. A TTL low-level program pulse applied to an MX27C8000 CE input with OE/VPP = 12.5 ± 0.5 Vwill program that MX27C8000. A high-level CE input inhibits the other MX27C8000s 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 /VPPand 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 MX27C8000.

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 MX27C8000, 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 MX27C8000 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's, assuming that CE has been LOW and addresses have been stable for at least tACC - tOE.

STANDBY MODE

The MX27C8000 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 MX27C8000 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.

P/N: PM00259

REV. 3.5, AUG. 20, 2001

MX27C8000

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 VIH VH 80H

NOTES: 1. VH = 12.0 V ± 0.5 V

2. X = Either VIH or VIL

P/N: PM00259

3. A1 - A8 = A10 - A19 = VIL(For auto select)

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

REV. 3.5, AUG. 20, 2001

FIigure 1. FAST PROGRAMMING FLOW CHART

ADDRESS = FIRST LOCATION

VCC = 6.25V

OE/VPP = 12.75V

PROGRAM ONE 50 us PULSE

MX27C8000

START

INCREMENT ADDRESS

LAST

ADDRESS ?

YES

PASS

ADDRESS = FIRST LOCATION

PROGRAM ONE 50us 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: PM00259

REV. 3.5, AUG. 20, 2001

SWITCHING TEST CIRCUITS

MX27C8000

DEVICE UNDER

TEST

CL = 100 pF including jig capacitance(60pF for 100ns parts)

SWITCHING TEST WAVEFORMS

AC driving levels

AC TESTING: AC driving levels are 2.4V/0.4V for commercial 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: PM00259

REV. 3.5, AUG. 20, 2001

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