T-8110L AGERE [Agere Systems], T-8110L Datasheet - Page 20

• Manufacturer Part Number: T-8110L
• Manufacturer: AGERE [Agere Systems]

Ambassador T8110L H.100/H.110 Switch
2 Pin Description
2.3 Special Buffer Requirements
2.3.1 H1x0 Bus Signal Internal Pull-Up/Pull-Down
The H1x0 bus pins require special consideration for H.100 and H.110 usage. There are two control pins to select
between various internal bus pull-ups/pull-downs, as shown below:
!
!
Note: The two H1x0 enables are active-high. Only one or the other should ever be asserted.
Warning: Do not assert both at the same time.
Please refer to Figure 1 for more detail.
2.3.2 Local Bus Signal Internal Pull-Up
The LPUE input is active-high; and is used to activate pull-ups on the following local signals: GP[7:0], FG[7:0],
D[15:0], LD[31:0], LREF[7:0], PRI_REF_IN, NR1_DIV_IN, and NR2_DIV_IN.
20
H100_ENABLE. Enables internal 50 k
CT_C8_B, /CT_FRAME_A, and /CT_FRAME_B signals.
H110_ENABLE. Enables internal 20 k pull-downs on all 32 CT_Dn signals, CT_NETREF1, and CT_NETREF2
to the VPRECHARGE signal.
Figure 1. T8110L Pull-Up/Pull-Down Arrangement for H1x0 Pins
(continued)
TO OTHER
CT_Dn
pull-ups on CT_Dn, CT_NETREF1, CT_NETREF2, CT_C8_A,
CT_Dn, CT_NETREF1, CT_NETREF2
V
V
DD
DD
20 k , MIN
50 k , MIN
50 k , MIN
/CT_FRAME_A, /CT_FRAME_B
CT_C8_A, CT_C8_B,
PAD
PAD
PAD
PAD
PAD
VPRECHARGE
H100_ENABLE
H110_ENABLE
APPLY 0.7 V, NOMINAL
Agere Systems Inc.
February 2004
5-9611 (F)