FG484 datasheet(37/162 Pages) MICROSEMI

37 / 162 page

ProASIC3E Flash Family FPGAs

Revision 13

2-23

Table 2-23 • Schmitt Trigger Input Hysteresis

Hysteresis Voltage Value (typ.) for Schmitt Mode Input Buffers

Input Buffer Configuration

Hysteresis Value (typ.)

3.3 V LVTTL/LVCMOS/PCI/PCI-X (Schmitt trigger mode)

240 mV

2.5 V LVCMOS (Schmitt trigger mode)

140 mV

1.8 V LVCMOS (Schmitt trigger mode)

80 mV

1.5 V LVCMOS (Schmitt trigger mode)

60 mV

Table 2-24 • I/O Input Rise Time, Fall Time, and Related I/O Reliability*

Input Buffer

Input Rise/Fall Time

(min.)

Input Rise/Fall Time (max.)

Reliability

LVTTL/LVCMOS

(Schmitt trigger disabled)

No requirement

10 ns *

20 years

(110°C)

LVTTL/LVCMOS

(Schmitt trigger enabled)

No requirement

No requirement, but input noise

voltage

cannot

exceed

Schmitt

hysteresis.

20 years

(110°C)

HSTL/SSTL/GTL

No requirement

10 ns *

10 years

(100°C)

LVDS/B-LVDS/M-LVDS/

LVPECL

No requirement

10 ns *

10 years

(100°C)

Note: *For clock signals and similar edge-generating signals, refer to the "ProASIC3/E SSO and Pin

Placement Guidelines" chapter of the ProASIC3E FPGA Fabric User’s Guide. The maximum input

rise/fall time is related to the noise induced into the input buffer trace. If the noise is low, then the

rise time and fall time of input buffers can be increased beyond the maximum value. The longer the

rise/fall times, the more susceptible the input signal is to the board noise. Microsemi recommends

signal integrity evaluation/characterization of the system to ensure that there is no excessive noise

coupling into input signals.

FG484 Datasheet(PDF) 37 Page - Microsemi Corporation

FG484 Datasheet(HTML) 37 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL