CY7C331 Datasheet, PDF (1/18 Pages) Cypress Semiconductor – Asynchronous Registered EPLD

1CY7C331
fax id: 6016
CY7C331
Asynchronous Registered EPLD
Features
• Twelve I/O macrocells each having:
— One state flip-flop with an XOR sum-of-products
input
— One feedback flip-flop with input coming from the
I/O pin
— Independent (product term) set, reset, and clock in-
puts on all registers
— Asynchronous bypass capability on all registers un-
der product term control (r = s = 1)
— Global or local output enable on three-state I/O
— Feedback from either register to the array
• 192 product terms with variable distribution to macro-
cells
• 13 inputs, 12 feedback I/O pins, plus 6 shared I/O mac-
rocell feedbacks for a total of 31 true and complemen-
tary inputs
• High speed: 20 ns maximum t_PD
• Security bit
• Space-saving 28-pin slim-line DIP package; also avail-
able in 28-pin PLCC
• Low power
— 90 mA typical I_CC quiescent
— 180 mA I_CC maximum
— UV-erasable and reprogrammable
— Programming and operation 100% testable
Functional Description
The CY7C331 is the most versatile PLD available for asyn-
chronous designs. Central resources include twelve full D-type
flip-flops with separate set, reset, and clock capability. For in-
creased utility, XOR gates are provided at the D-inputs and the
product term allocation per flip-flop is variably distributed.
I/O Resources
Pins 1 through 7 and 9 through 14 serve as array inputs; pin
14 may also be used as a global output enable for the I/O
macrocell three-state outputs. Pins 15 through 20 and 23
through 28 are connected to I/O macrocells and may be man-
aged as inputs or outputs depending on the configuration and
the macrocell OE terms.
Logic Block Diagram
OE/I₁₂
I₁₁
I₁₀
I₉
I₈
I₇
GND
I₆
I₅
I₄
I₃
I₂
I₁
I₀
14
13
12
11
10
9
8
7
6
5
4
3
2
1
4
12
PROGRAMMABLE AND ARRAY
(192x62)
6
10
8
8
8
8
10
6
12
4
15
16
17
18
19
20
I/O₁₁
I/O₁₀
I/O₉
I/O₈
I/O₇
I/O₆
21
22
GND
V_CC
23
24
I/O₅
I/O₄
25
26
27
28
I/O₃
I/O₂
I/O₁
I/O₀ ^C331–1
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
January 1989 – Revised December 1992