Device Architecture
2-204 Revision 4
3.3 V GTL+
Gunning Transceiver Logic Plus is a high-speed bus standard (JESD8-3). It provides a differential
amplifier input buffer and an open-drain output buffer. The VCCI pin should be connected to 3.3 V.
Timing Characteristics
Table 2-144 • Minimum and Maximum DC Input and Output Levels
3.3 V GTL+ VIL VIH VOL VOH IOL IOH IOSL IOSH IIL
1
IIH
2
Drive
Strength
Min.
V
Max.
V
Min.
V
Max.
V
Max.
V
Min.
VmAmA
Max.
mA
3
Max.
mA
3
µA
4
µA
4
35 mA –0.3 VREF – 0.1 VREF + 0.1 3.6 0.6 – 35 35 181 268 10 10
Notes:
1. IIL is the input leakage current per I/O pin over recommended operation conditions where –0.3 V < VIN < VIL.
2. IIH is the input leakage current per I/O pin over recommended operating conditions VIH < VIN < VCCI. Input current is
larger when operating outside recommended ranges.
3. Currents are measured at high temperature (100°C junction temperature) and maximum voltage.
4. Currents are measured at 85°C junction temperature.
Figure 2-126 • AC Loading
Table 2-145 • AC Waveforms, Measuring Points, and Capacitive Loads
Input Low (V) Input High (V) Measuring Point* (V) VREF (typ.) (V) VTT (typ.) (V) C
LOAD
(pF)
VREF – 0.1 VREF + 0.1 1.0 1.0 1.5 10
Note: *Measuring point = Vtrip. See Table 2-90 on page 2-169 for a complete table of trip points.
Test Point
10 pF
25
GTL+
VTT
Table 2-146 • 3.3 V GTL+
Commercial Temperature Range Conditions: T
J
= 70°C, Worst-Case VCC = 1.425 V,
Worst-Case VCCI = 3.0 V, VREF = 1.0 V
Speed
Grade t
DOUT
t
DP
t
DIN
t
PY
t
EOUT
t
ZL
t
ZH
t
LZ
t
HZ
t
ZLS
t
ZHS
Units
Std. 0.66 2.06 0.04 1.59 0.43 2.09 2.06 4.33 4.29 ns
–1 0.56 1.75 0.04 1.35 0.36 1.78 1.75 3.68 3.65 ns
–2 0.49 1.53 0.03 1.19 0.32 1.56 1.53 3.23 3.20 ns
Note: For the derating values at specific junction temperature and voltage supply levels, refer to Tab le 3-7 on
page 3-9.