Security Fuse Usage

A single fuse is provided to prevent unauthorized copying of the

ATV5000 fuse patterns. Once programmed, all outputs appear

programmed during verify. The security fuse should be pro-

grammed last (after verifying all other programmed bits), as its

effect is immediate.

The security fuse also inhibits preload and observability.

Erasure Characteristics

The entire memory array of an ATV5000 is erased after expo-

sure to ultraviolet light at a wavelength of 2537 Å. Complete

erasure is assured after a minimum of 20 minutes exposure using

12,000

chip. Minimum erase time for lamps at other intensity ratings

can be calculated from the minimum integrated erasure dose of

bel is recommended to cover the clear window on any UV eras-

able PLD which will be subjected to continuous fluorescent in-

door lighting or sunlight.

ATV5000 PLCC/PGA Pin Assignments

PLCC

Pin

PGA

Pin

Name

PLCC

Pin

PGA

Pin

Name

PLCC

Pin

PGA

Pin

Name

PLCC

Pin

PGA

Pin

Name

1

B6

IN

18

F2

I/O

35

K6

IN

52

F10

I/O

2

A6

IN

19

F1

I/O

36

L6

IN

53

F11

I/O

3

B5

VCC

20

G2

VCC

37

K7

VCC

54

E10

VCC

4

A5

I/O

21

G1

I/O

38

L7

I/O

55

E11

I/O

5

B4

I/O

22

H2

I/O

39

K8

I/O

56

D10

I/O

6

A4

I/O

23

H1

I/O

40

L8

I/O

57

D11

I/O

7

B3

I/O

24

J2

I/O

41

K9

I/O

58

C10

I/O

8

A3

I/O

25

J1

I/O

42

L9

I/O

59

C11

I/O

9

A2

I/O

26

K1

I/O

43

L10

I/O

60

B11

I/O

10

B2

I/O

27

K2

I/O

44

K10

I/O

61

B10

I/O

11

B1

I/O

28

L2

I/O

45

K11

I/O

62

A10

I/O

12

C2

I/O

29

K3

I/O

46

J10

I/O

63

B9

I/O

13

C1

I/O

30

L3

I/O

47

J11

I/O

64

A9

I/O

14

D2

I/O

31

K4

I/O

48

H10

I/O

65

B8

I/O

15

D1

I/O

32

L4

IN

49

H11

I/O

66

A8

IN

16

E2

GND

33

K5

GND

50

G10

GND

67

B7

GND

17

E1

I/O

34

L5

IN

51

G11

I/O

68

A7

IN

Pin Capacitance

(f = 1 MHz, T = 25°C)

(1)

Typ

Max

Units

Conditions

68

pF

812

pF

Note:

1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.

1-202

ATV5000/L