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UVEPROM
Austin Semiconductor, Inc. 256K UVEPROM
UV Erasable Programmable Read-Only Memory
AVAILABLE AS MILITARY SPECIFICATIONS
* -55C to 125C operation * MILITARY Processing Method MIL-PRF-38535, Class Q * Commercial Version Available
AS27C256
PIN ASSIGNMENT (Top View)
28-Pin DIP (J) (600 MIL)
VPP A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 Vcc A14 A13 A8 A9 A11 G\ A10 E\ DQ7 DQ6 DQ5 DQ4 DQ3
FEATURES
Organized 32,768 x 8 Single +5V 10% power supply Pin-compatible with existing 256K ROM's and EPROM's All inputs/outputs fully TTL compatible Power-saving CMOS technology Very high-speed FLASHRITE Pulse Programming 3-state output buffers 400-mV DC assured noise immunity with standard TTL loads * Latchup immunity of 250 mA on all input and output pins * Low power dissipation (CMOS Input Levels) -Active - 165mW Worst Case -Standby - 1.7mW Worst Case (CMOS-input levels) * FUTURE High Speed Offerings: 55ns, 70ns, 90ns * * * * * * * *
32-Pin LCC (ECA) (450 x 550 mils)
A7 A12 A12 A14 6 A10 VPP NC NC VCC VCC A15 A14 CE2 A13
4 3 2 1 32 31 30
OPTIONS
* Timing 120ns access 150ns access 170ns access 200ns access 250ns access 300ns access 55ns access 70ns access 90ns access
MARKING
-12 -15 -17 -20 -25 -30 -55 -70 -90
A6 5 A7 A5 6 A6 A4 7 A5 A3 8 A4 A2 9 A3 A2 10 A1 A1 11 A0 A0 12 NC DQ1 13 DQ0
29 A8 \ WE 28 A9 A13 27 A11 A8 26 NC A9 25 G\ A11 24 A10 \ OE 23 E\ A10 22 DQ7 \ CE1 21 DQ6 DQ8
14 15 16 17 18 19 20
Pin Name Pin A14 A0 - Name DQ0-DQ7 E\ G\ GND VCC
Function Function Address Inputs Inputs (programming)/Outputs Chip Enable/Power Down Output Enable Ground 5V Supply 13V Programming Power Supply
* Package(s) Ceramic DIP (600mils) J No. 110 Ceramic LCC (450 x 550 mils) ECA No. 208 * Processing / Operating Temperature Ranges Full Military (-55oC to +125oC) M Industrial (-40C to +85C) I Military Temp (-55oC to +125oC) XT
VPP
For more products and information please visit our web site at www.austinsemiconductor.com
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS27C256 Rev. 2.0 7/06
1
DQ1 DQ2 DQ2 DQ3 VSS GND DQ4 NC DQ5 DQ3 DQ6 DQ4 DQ7 DQ5
UVEPROM
Austin Semiconductor, Inc.
GENERAL DESCRIPTION
The AS27C256 series is a set of 262,144 bit, ultraviolet-light erasable, electrically programmable read-only memories. These devices are fabricated using power-saving CMOS technology for high speed and simple interface with MOS and bipolar circuits. All inputs (including program data inputs) can be driven by Series 54 TTL circuits without the use of external pullup resistors. Each output can drive one Series 54 TTL circuit without external resistors. The data outputs are 3-state for connecting multiple devices to a common bus. The AS27C256 is pin-compatible with 28-pin 256K ROMs and EPROMs. It is offered in a 600mil dual-in-line ceramic package (J suffix) and a 450 x 550 mil ceramic LCC (ECA suffix) rated for operation from -55C to 125C. Because this EPROM operates from a single 5V supply (in the read mode), it is ideal for use in microprocessor-based systems. One other supply (12.75V) is needed for programming. All programming signals are TTL level. This device is programmable by the AMD FLASHRITE Pulse programming algorithm. The FLASHRITE Pulse programming algorithm uses a VPP of 12.75VV and a VCC of 6.25V for a nominal programming time of four seconds. For programming outside the system, existing EPROM programmers can be used. Locations can be programmed singly, in blocks, or at random.
AS27C256
FUNCTIONAL BLOCK DIAGRAM*
EPROM 32,768 x 8 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 E\ G\ 10 9 8 7 6 5 4 3 25 24 21 23 2 26 27 20 22 0
A
0 32,767
A A A A A A A A
11 12 13 15 16 17 18 19
DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7
14 [PWR DWN] & EN
* This symbol is in accordance with ANSI/IEEE std 91-1984 and IEC Publication 617-12.
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
2
UVEPROM
Austin Semiconductor, Inc.
OPERATION
The seven modes of operation for the AS27C256 are listed in Table 1. The read mode requires a single 5V supply. All inputs are TTL level except for VPP during programming (12.75V for FLASHRITE Pulse), and (12V) on A9 for signature mode.
AS27C256
TABLE 1. OPERATION MODES
FUNCTION (PINS) E\ G\ VPP VCC A9 A0 DQ0-DQ7 READ VIL VIL X1 VCC X X Data Out MODE* OUTPUT STANDBY PROGRAMMING VERIFY DISABLE VIL VIH X1 VCC X X High-Z VIH X X1 VCC+/-.3V X X High-Z VIL VIH VPP VCC X X Data In VIH VIL VPP VCC X X Data Out PROGRAM SIGNATURE MODE INHIBIT VIL VIH X VPP VCC X X High-Z
2 VID
VIL VCC VCC VID
2
VIH CODE** MFG DEVICE 01h 10h
VIL
1 2
For normal standby & read operation, VPP is Don't Care X. VID = 12V +/- .5V
NOTES: * X can be VIL or VIH
**
Die is AMD. User can program on benchtop programmer by selecting AM27C256 from the device type selection menu.
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
3
UVEPROM
Austin Semiconductor, Inc.
READ/OUTPUT DISABLE
When the outputs of two or more AS27C256 are connected in parallel on the same bus, the output of any particular device in the circuit can be read with no interference from the competing outputs of the other devices. To read the output of the selected AS27C256, a low-level signal is applied to E\ and G\. All other devices in the circuit should have their outputs disabled by applying a high-level signal to one of these pins. Output data is accessed at pins DQ0 through DQ7.
AS27C256
FLASHRITE PULSE PROGRAMMING
The AS27C256 EPROM is programmed by using the AMD FLASHRITE Pulse programming algorithm as illustrated by the flowchart in Figure 1. This algorithm programs the device in a nominal time of 4 seconds. Actual programming time varies as a function of the programmer used. Data is presented in parallel (eight bits) on pins DQ0 to DQ7. Once addresses and data are stable, E\ is pulsed. The FLASHRITE Pulse programming algorithm uses initial pulses of 100 microseconds (s) followed by a byte-verification step to determine when the addressed byte has been successfully programmed. Up to 25 100s pulses per byte are provided before a failure is recognized. The programming mode is achieved when VPP = 12.75V, VCC= 6.25V, G\ = VIH, and E\ = VIL. More than one device can be programmed when the devices are connected in parallel. Locations can be programmed in any order. When the AMD FLASHRITE Pulse programming routine is completed, all bits are verified with VCC = VPP = 5V.
LATCHUP IMMUNITY
Latchup immunity on the AS27C256 is a minimum of 250mA on all inputs and outputs. This feature provides latchup immunity beyond any potential transients at the printed circuit board level when the EPROM is interfaced to industry standard TTL or MOS logic devices. Input/output layout approach controls latchup without compromising performance or packing density.
POWER DOWN
Active ICC supply current can be reduced from 25mA (AS27C25612 through AS27C256-25) to 1mA (TTL-level inputs) or 300A (CMOS-level inputs) by applying a high TTL/CMOS signal to the E\ pin. In this mode all outputs are in the high-impedance state.
PROGRAM INHIBIT
Programming can be inhibited by maintaining a high-level input on E\.
ERASURE
Before programming, the AS27C256 is erased by exposing the chip through the transparent lid to a high-intensity ultraviolet light (wavelength 2537 A). EPROM erasure before programming is necessary to ensure that all bits are in the logic-high state. Logic-lows are programmed into the desired locations. A programmed logic-low can be erased only by ultraviolet light. The recommended minimum exposure dose (UV intensity x exposure time) is 15W*s/cm2. A typical 12mW/cm2, filterless UV lamp erases the device in 21 minutes. The lamp should be located about 2.5cm above the chip during erasure. After erasure, all bits are in the high state. It should be noted that normal ambient light contains the correct wavelength for erasure; therefore, when using the AS27C256, the window should be covered with an opaque label.
PROGRAM VERIFY
Programmed bits can be verified with VPP = 12.75V when G\ = VIL, and E\ = VIH.
SIGNATURE MODE
The signature mode provides access to a binary code identifying the manufacturer and device type. This mode is activated when A9 is forced to 12V 0.5V. Two identifier bytes are accessed by A0 (terminal 10); i.e., A0=VIL accesses the manufacturer code, which is output on DQ0-DQ7; A0=VIH accesses the device code, which is also output on DQ0-DQ7. All other addresses must be held at VIL. Each byte contains odd parity on bit DQ7. The manufacturer code for these devices is 01h and the device code is 10h.
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
4
UVEPROM
Austin Semiconductor, Inc.
AS27C256
FIGURE 1. FLASHRITE PULSE PROGRAMMING FLOWCHART
Start Address = First Location VCC=6.25V, VPP=12.75V X=0 Program One 100us Pulse Increment X Programming Section X = 25 ? NO Program Verify Byte? Pass Last Address? YES
FAIL
Increment Address
NO
Yes VCC = VPP = 5.25V
Read Verify Section
READ Verify Bytes?
FAIL
Device Failed
Pass Device Passed
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
5
UVEPROM
Austin Semiconductor, Inc.
ABSOLUTE MAXIMUM RATINGS* Supply Voltage Range, VCC**...........................-0.6V to +7.0V Supply Voltage Range, Vpp**...............................-0.6V to +13.5V Input Voltage Range, All inputs except A9**..-0.6V to +6.0V A9.....-0.6V to +13.5V Output Voltage Range**...............................-0.6V to VCC +.6V Minimum Operating Free-air Temperature, TA..............-55C Maximum Operating Case Temperature, TC...................125C Storage Temperature Range, Tstg.....................-65C to 150C
AS27C256
*Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ** All voltage values are with respect to GND.
RECOMMENDED OPERATING CONDITIONS
VCC VPP VIH VIL VID TA TC Supply Voltage Supply Voltage Read Mode FLASHRITE Pulse programming algorithm Read Mode FLASHRITE Pulse programming algorithm TTL inputs CMOS inputs Low-level input voltage Voltage level on A9 for signature mode Operating free-air temperature Operating case temperature TTL inputs CMOS inputs
2 1
MIN 4.5 6
TYP 5 6.25 12.75
MAX 5.5 6.5 VCC-0.6 13 VCC+.6 VCC+.6 0.8 0.2
12.5 2.2 VCC-0.2 -0.5 -0.5 11.5 -55
High-level input voltage
12
12.5
+125
NOTES: 1. VCC must be applied before or at the same time as VPP and removed after or at the same time as VPP. The deivce must not be inserted into or removed from the board when VPP or VCC is applied. 2. VPP can be connected to VCC directly (except in the program mode). VCC supply current in this case would be ICC2 + IPP1.
ELECTRICAL CHARACTERISTICS OVER RECOMMENDED RANGES OF SUPPLY VOLTAGE AND OPERATING FREE-AIR TEMPERATURE
PARAMETER VOH VOL II IO IPP1 IPP2 ICC1 High-level output voltage Low-level output voltage Input current (leakage) Output current (leakage) VPP supply current VPP supply current (during program pulse) VCC supply current (standby)
2
TEST CONDITIONS IOH = -400A IOL = 2.1mA VI = 0V to 5.5V VO = 0V to V CC VPP = VCC = 5.5V VPP = 13V VCC = 5.5V, E\=V IH VCC = 5.5V, E\=V CC E\=VIL, VCC=5.5V tcycle = minimum, outputs open
MIN 2.4
TYP
1
MAX
UNIT V
0.4 1 5 100 30 50 1 300
V A A A mA mA A
TTL-Input Level CMOS-Input Level '27C256-12 '27C256-15 '27C256-17 '27C256-20,-25
ICC2
VCC supply current (active)
15
25
mA
NOTES: 1. Typical values are at TA=25C and nominal voltages. 2. This parameter has been characterized at 25C and is not tested.
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
6
UVEPROM
Austin Semiconductor, Inc.
AS27C256
CAPACITANCE OVER RECOMMENDED RANGES OF SUPPLY VOLTAGE AND OPERATING FREE-AIR TEMPERATURE, f = 1MHz*
PARAMETER Ci Co Input capacitance Output capacitance TEST CONDITIONS VI = 0V VO = 0V TYP** 6 10 MAX 10 14 UNIT pF pF
* Capacitance measurements are made on a sample basis only. ** Typical values are at TA = 25C and nominal voltages.
SWITCHING CHARACTERISTICS OVER RECOMMENDED RANGES OF SUPPLY VOLTAGE AND OPERATING FREE-AIR TEMPERATURE1,2
PARAMETER ta(A) ta(E) Access time from address Access time from E\ see Figure 2 0
3
TEST CONDITIONS
1, 2
-12
-15
MIN MAX MIN MAX 120 120 40 30 0 0 150 150 50 30
UNIT ns ns ns ns ns
ten(G)R Output enable time from G\ tdis tv(A) Disable time of output from G\ or E\, whichever occurs first Output data valid time after change of address, E\, or G\, whichever occurs first
3
0
PARAMETER ta(A) ta(E) Access time from address Access time from E\
TEST CONDITIONS
1, 2
-17 170 170 50
-20 200 200 60 0 0 50 0 0
-25 250 250 60 60
MIN MAX MIN MAX MIN MAX
UNIT ns ns ns ns ns
ten(G)R Output enable time from G\ tdis tv(A) Disable time of output from G\ or E\, whichever occurs first Output data valid time after change of address, E\, or G\, whichever occurs first
3 3
see Figure 2 0 0 40
NOTES: 1.Timing measurements are made at 2V for logic high and 0.8V for logic low (see figure 2). 2. Common test conditions apply for tdis except during programming. 3. Value calculated from 0.5V delta to measured output level. This parameter is only sampled and not 100% tested.
SWITCHING CHARACTERISTICS FOR PROGRAMMING: VCC = 6.5V and VPP = 12.75V (AMD FLASHRITE ALGO), TA = 25C
PARAMETER tdis(G) Output disable time from G\ ten(G)W Output enable time from G\ MIN 0 MAX 130 150 UNIT ns ns
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
7
UVEPROM
Austin Semiconductor, Inc.
AS27C256
RECOMMENDED TIMING REQUIREMENTS FOR PROGRAMMING: VCC = 6.5 and VPP = 12.75V (AMD FLASHRITE ALGO), TA = 25C (See Figure 2)
th(A) th(D) tw(E)PR tsu(A) tsu(G) tsu(E) tsu(D) Hold Time, Address Hold Time, Data Pulse Duration, Initial Program Setup Time, Address Setup Time, G\ Setup Time, E\ Setup Time, Data MIN 0 2 95 2 2 2 2 2 2 100 105 TYP MAX UNIT s s s s s s s s s
tsu(VPP) Setup Time, VPP tsu(VCC) Setup Time, VCC
PARAMETER MEASUREMENT INFORMATION
2.08V RL = 800 Output Under Test CL = 100 pF1
NOTES: 1. CL includes probe and fixture capacitance.
The AC testing inputs are driven at 2.4V for logic high and 0.4V for logic low. Timing measurements are made at 2V for logic high and 0.8V for logic low for both inputs and outputs.
FIGURE 2. LOAD CIRCUIT AND VOLTAGE WAVEFORMS
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
8
UVEPROM
Austin Semiconductor, Inc.
FIGURE 3. READ-CYCLE TIMING
AS27C256
FIGURE 4. PROGRAM-CYCLE TIMING (FLASHRITE PULSE PROGRAMMING)
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
9
UVEPROM
Austin Semiconductor, Inc. MECHANICAL DEFINITION*
AS27C256
ASI Case #110 (Package Designator J)
D
S2
Q
A
L
E S1 b2 e b
eA c
Symbol A b b2 c D E eA e L Q S1 S2
SMD Specifications MIN MAX --0.232 0.014 0.026 0.045 0.065 0.008 0.018 --1.490 0.500 0.610 0.600 BSC 0.100 BSC 0.125 0.200 0.015 0.060 0.005 --0.005 ---
*All measurements are in inches.
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
10
UVEPROM
Austin Semiconductor, Inc. MECHANICAL DEFINITIONS* ASI Case #208 (Package Designator ECA)
AS27C256
D1
A L1
e E E1 See Detail A
D
L
Detail A
b1
b
SYMBOL A b b1 D D1 E E1 e L L1
SMD SPECIFICATIONS MIN MAX 0.060 0.120 0.022 0.028 0.006 0.022 0.442 0.458 0.300 BSC 0.540 0.560 0.400 BSC 0.050 BSC 0.045 0.055 0.075 0.095
*All measurements are in inches.
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
11
UVEPROM
Austin Semiconductor, Inc. ORDERING INFORMATION
EXAMPLE: AS27C256-30JM/MIL
Device Number AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 Speed -55 -70 -90 -12 -15 -17 -20 -25 -30 Package Type J J J J J J J J J Operating Temp. * * * * * * * * *
AS27C256
EXAMPLE: AS27C256-15ECAM
Device Number AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 AS27C256 Speed -55 -70 -90 -12 -15 -17 -20 -25 -30 Package Type ECA ECA ECA ECA ECA ECA ECA ECA ECA Operating Temp. * * * * * * * * *
*PROCESS / OPERATING TEMPERATURE M = Full Military Processing Per -55oC to +125oC MIL-PRF-3835, Class Q I = Industrial Temperature Range -40C to +85C XT = Military Temperature Range -55oC to +125oC
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
12
UVEPROM
Austin Semiconductor, Inc.
AS27C256
SMD ORDERING INFORMATION
SMD 5962-8606301XA 5962-8606311XA 5962-8606302XA 5962-8606312XA 5962-8606303XA 5962-8606313XA 5962-8606304XA 5962-8606314XA 5962-8606305XA 5962-8606315XA 5962-8606306XA 5962-8606316XA 5962-8606307XA 5962-8606317XA 5962-8606308XA 5962-8606318XA 5962-8606309XA 5962-8606319XA ASI PN AS27C256 -20JM AS27C256 -20JM AS27C256 -25JM AS27C256 -25JM AS27C256 -30JM AS27C256 -30JM AS27C256 -17JM AS27C256 -17JM AS27C256 -15JM AS27C256 -15JM AS27C256 -12JM AS27C256 -12JM AS27C256 -90JM AS27C256 -90JM AS27C256 -70JM AS27C256 -70JM AS27C256 -55JM AS27C256 -55JM SPEED 200ns 200ns 250ns 250ns 300ns 300ns 170ns 170ns 150ns 150ns 120ns 120ns 90ns 90ns 70ns 70ns 55ns 55ns PACKAGE 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP 600mil, 28LD. DIP
SMD 5962-8606301YA 5962-8606311YA 5962-8606302YA 5962-8606312YA 5962-8606303YA 5962-8606313YA 5962-8606304YA 5962-8606314YA 5962-8606305YA 5962-8606315YA 5962-8606306YA 5962-8606316YA 5962-8606307YA 5962-8606317YA 5962-8606308YA 5962-8606318YA 5962-8606309YA 5962-8606319YA
ASI PN AS27C256 -20ECA AS27C256 -20ECA AS27C256 -25ECA AS27C256 -25ECA AS27C256 -30ECA AS27C256 -30ECA AS27C256 -17ECA AS27C256 -17ECA AS27C256 -15ECA AS27C256 -15ECA AS27C256 -12ECA AS27C256 -12ECA AS27C256 -90ECA AS27C256 -90ECA AS27C256 -70ECA AS27C256 -70ECA AS27C256 -55ECA AS27C256 -55ECA
SPEED 200ns 200ns 250ns 250ns 300ns 300ns 170ns 170ns 150ns 150ns 120ns 120ns 90ns 90ns 70ns 70ns 55ns 55ns
PACKAGE 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC 32-LD. 0.450 x 0.550, LCC
AS27C256 Rev. 2.0 7/06
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
13

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