EP220 & EP224 Classic EPLDs
Table 1. EP220- and EP224-Compatible Devices (Part 4 of 4)
PAL/GAL Vendor
Texas Instruments,
Inc.
(continued)
PAL/GAL Device
TIBPAL16L8
TIBPAL16R6
TIBPAL16R8
TIBPAL20L8
TIBPAL20R6
TIBPAL20R8
Altera Replacement
Device
EP220-12
Speed
Grade
-12
EP224-12
Power-On
Characteristics
Design Security
The EP220 and EP224 inputs and outputs respond a maximum of 1
µs
after V
CC
power-up (V
CC
= 4.75 V), or after a power-loss/power-up
sequence. All macrocells that are programmed as registers are set to a
logic low on power-up.
EP220 and EP224 devices contain a programmable Security Bit that
controls access to the data programmed into the device. When this bit is
turned on, a proprietary design implemented in the device cannot be
copied or retrieved. This feature provides a high level of design security,
because programmed data within EPROM cells is invisible. The Security
Bit that controls this function, as well as all other program data, is reset
when a device is erased.
The -10A and -12 speed grades of the EP220 and EP224 devices contain a
programmable Turbo Bit to control the automatic power-down feature
that enables the low-standby-power mode (I
CC
). When the Turbo Bit is
turned on, the low-standby-power mode is disabled. All AC values are
tested with the Turbo Bit turned on. When the device is operating with the
Turbo Bit turned off (non-turbo mode), a non-turbo adder must be added
to the appropriate AC parameter to determine worst-case timing. The
non-turbo adder is specified in the
“AC Operating Conditions”
tables in
this data sheet.
EP220 and EP224 devices are fully functionally tested and guaranteed.
Complete testing of each programmable EPROM configuration element
and all internal logic elements ensures 100% programming yield.
Figure 3
shows AC test conditions.
Turbo Bit
Generic Testing
8
Altera Corporation
ALTERA [ ALTERA CORPORATION ]
