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參數(shù)資料
| 型號： | PAL22V10Z-30I |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | EPICE CMOS PROGRAMMABLE ARRAY LOGIC CIRCUITS |
| 中文描述： | EPICE CMOS可編程陣列邏輯電路 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 202K |
| 代理商： | PAL22V10Z-30I |
TICPAL22V10Z-25C, TICPAL22V10Z-30I
EPIC
CMOS PROGRAMMABLE ARRAY LOGIC CIRCUITS
SRPS007C – D3323, SEPTEMBER 1989 – REVISED FEBRUARY 1992
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
14
special design features
True CMOS Outputs:
Each TICPAL22V10Z output is designed with a P-channel pull-up transistor and an
N-channel pull-down transistor, a true CMOS output with rail-to-rail output switching. This provides direct
interface to CMOS logic, memory, or ASIC devices without the need for a pull-up resistor. The CMOS output
has 16-mA drive capability, which makes the TICPAL22V10Z an ideal substitute for bipolar PLDs. The electrical
characteristics of this device show the output under both CMOS and TTL conditions.
Simultaneous Switching:
High-performance CMOS devices often have output glitches on nonswitched
outputs when a large number of outputs are switched simultaneously. This glitch is commonly referred to as
”ground bounce” and is most noticeable on outputs held at V
OL
(low-level output voltage). Ground bounce is
caused by the voltage drop across the inductance in the package lead when current is switched (dv
α
I x di/dt).
One solution is to restrict the number of outputs that can switch simultaneously. Another solution is to change
the device pinout such that the ground is located on a low-inductance package pin. TI opted for a third option
in order to maintain pinout compatibility and eliminate functional constraints. This option controls the output
transistor turn-on characteristics and puts a limit on the instantaneous current available to the load, much like
the I
OS
resistor in a TTL circuit.
Wake-Up Features:
The TICPAL22V10Z employs input signal transition detection techniques to power up the
device from the standby-power mode. The transition detector monitors all inputs, I/Os, and feedback paths.
Whenever a transition is sensed, the detector activates the power-up mode. The device will remain in the
power-up mode until the detector senses that the inputs and outputs have been static for about 40 ns; thereafter,
the device returns to the standby mode.
Turbo Mode or Zero-Power Mode:
When the turbo cell is programmed, the device will be set to the power-up
mode. Therefore, the delay associated with its transition detection and power up will be eliminated. This is how
the faster propagation delays and shorter setup times are obtained in the turbo mode. The turbo mode and the
associated speed increase can be effectively simulated with the turbo cell erased, if a series of adjacent input,
I/O, or feedback edges occur with an interval of about 25 ns or less between these adjacent edges. Under these
conditions, the TICPAL22V10Z will never have the opportunity to power down due to the frequency of the
adjacent edges.
Power Up
: The TICPAL22V10Z device configuration bits (power mode, and macrocell configuration) are read
at the first input transition after a monotonic power up. When completed, the TICPAL22V10Z is in its designed
configuration. The use of an initializing device reset is necessary in applications where registered feedback is
used to ensure the TICPAL22V10Z is in a known state at the beginning of system operation.
Power Dissipation
: Power dissipation of the TICPAL22V10Z is defined by three contributing factors, and the
total power dissipation is the sum of all three.
Standby Power:
The product of V
CC
and the standby I
CC
. The standby current is the reverse current
through the diodes that are reversed biased. This current is very small, and for circuits that remain in static
condition for a long time, this low amount of current can become a major performance advantage.
Dynamic Power:
The product of V
CC
and the dynamic current. This dynamic current flows through the
device only when the transistors are switching from one logic level to the other. The total dynamic current
for the TICPAL22V10Z is dependent upon the users’ configuration of the device and the operating
frequency. Output loading can be a source of additional power dissipation.
Interface Power:
The product of I
CC
(interface) and V
CC
. The total interface power is dependent on the
number of inputs at the TTL V
OH
level. The interface power can be eliminated by the addition of a pull-up
resistor.
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