CBT16212
24-bit bus exchange switch with 12-bit output enables
Rev. 02 — 3 November 2008
Product data sheet
1. General description
The CBT16212 provides 24 bits of high-speed TTL-compatible bus switching or
exchanging. The low ON resistance of the switch allows connections to be made with
minimal propagation delay.
The CBT16212 operates either as a 24-bit bus switch or as a 12-bit bus exchanger,
providing data exchange between four signal ports using the port select inputs (S0, S1
and S2).
The CBT16212 is characterized for operation from –40
°C
to +85
°C.
2. Features
I
5
Ω
switch connection between two ports
I
TTL compatible input levels
I
ESD protection:
N
HBM JESD22-A114E Class 1C exceeds 1500 V
N
CDM JESD22-C101C exceeds 1000 V
I
Latch-up performance:
N
JESD78 exceeds 100 mA
3. Ordering information
Table 1.
Ordering information
Package
Temperature range Name
CBT16212DGG
CBT16212DL
−40 °C
to 85
°C
−40 °C
to 85
°C
TSSOP56
SSOP56
Description
plastic thin shrink small outline package; 56 leads;
body width 6.1 mm
plastic shrink small outline package; 56 leads; body
width 7.5 mm
Version
SOT364-1
SOT371-1
Type number
NXP Semiconductors
CBT16212
24-bit bus exchange switch with 12-bit output enables
4. Functional diagram
1B1
2
3
1A1
1A2
1B2
2B1
2A1
2A2
2B2
3B1
3A1
3A2
3B2
4B1
4A1
4A2
4B2
5B1
5A1
5A2
5B2
6B1
6A1
6A2
6B2
7B1
7A1
7A2
7B2
8B1
8A1
8A2
8B2
9B1
9A1
9A2
9B2
10B1
10A1
10A2
10B2
11B1
11A1
11A2
11B2
12B1
12A1
12A2
12B2
S0
S1
S2
001aai356
54
53
52
4
5
51
50
6
7
48
47
9
10
46
45
11
12
44
43
13
14
42
41
15
16
40
39
18
20
37
36
21
22
1A1
35
34
2
1 of 12 channels
54
1B1
23
24
33
32
25
26
31
30
1A2
3
53
1B2
27
28
1
56
55
FLOW CONTROL
29
S0
S1
S2
1
56
55
001aai357
Fig 1.
Functional diagram
Fig 2.
Logic diagram
CBT16212_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 3 November 2008
2 of 12
NXP Semiconductors
CBT16212
24-bit bus exchange switch with 12-bit output enables
5. Pinning information
5.1 Pinning
S0
1A1
1A2
2A1
2A2
3A1
3A2
GND
4A1
1
2
3
4
5
6
7
8
9
56 S1
55 S2
54 1B1
53 1B2
52 2B1
51 2B2
50 3B1
49 GND
48 3B2
47 4B1
46 4B2
45 5B1
44 5B2
43 6B1
42 6B2
41 7B1
40 7B2
39 8B1
38 GND
37 8B2
36 9B1
35 9B2
34 10B1
33 10B2
32 11B1
31 11B2
30 12B1
29 12B2
001aai358
4A2 10
5A1 11
5A2 12
6A1 13
6A2 14
7A1 15
7A2 16
V
CC
17
8A1 18
GND 19
8A2 20
9A1 21
9A2 22
10A1 23
10A2 24
11A1 25
11A2 26
12A1 27
12A2 28
CBT16212
Fig 3.
Pin configuration SOT364-1 (TSSOP56) and SOT371-1 (SSOP56)
5.2 Pin description
Table 2.
Symbol
S0, S1, S2
1A1 to 12A1
1A2 to 12A2
GND
V
CC
1B1 to 12B1
1B2 to 12B2
Pin description
Pin
1, 56, 55
2, 4, 6, 9, 11, 13, 15, 18, 21, 23, 25, 27
3, 5, 7, 10, 12, 14, 16, 20, 22, 24, 26, 28
8, 19, 38, 49
17
54, 52, 50, 47, 45, 43, 41, 39, 36, 34, 32, 30
53, 51, 48, 46, 44, 42, 40, 37, 35, 33, 31, 29
Description
port select input
A1 port
A2 port
ground (0 V)
supply voltage
B1 port
B2 port
CBT16212_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 3 November 2008
3 of 12
NXP Semiconductors
CBT16212
24-bit bus exchange switch with 12-bit output enables
6. Functional description
Table 3.
S2
L
L
L
L
H
H
H
H
[1]
Function selection
[1]
Input/output
S1
L
L
H
H
L
L
H
H
S0
L
H
L
H
L
H
L
H
nA1
Z
nB1
nB2
Z
Z
Z
nB1
nB2
nA2
Z
Z
Z
nB1
nB2
Z
nB2
nB1
disconnect
nA1 = nB1
nA1 = nB2
nA2 = nB1
nA2 = nB2
disconnect
nA1 = nB1 and nA2 = nB2
nA1 = nB2 and nA2 = nB1
Function
Port select input
H = HIGH voltage level; L = LOW voltage level; Z = high-impedance OFF-state.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V
CC
V
I
I
IK
V
O
I
O
T
stg
P
tot
Parameter
supply voltage
input voltage
input clamping current
output voltage
output current
storage temperature
total power dissipation
T
amb
=
−40 °C
to +125
°C
SSOP56 package
TSSOP56 package
[1]
[2]
[3]
[4]
[3]
[4]
[1]
Conditions
Min
−0.5
−0.5
−50
−0.5
-
−65
-
-
Max
+7.0
+7.0
-
+5.5
128
+150
850
600
Unit
V
V
mA
V
mA
°C
mW
mW
V
I
< 0 V
output at HIGH level or OFF-state
output at LOW level
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150
°C.
Above 55
°C
the value of P
tot
derates linearly with 11.3 mW/K.
Above 55
°C
the value of P
tot
derates linearly with 8 mW/K.
8. Recommended operating conditions
Table 5.
Operating conditions
All unused control inputs of the device must be held at V
CC
or GND to ensure proper device operation.
Symbol
V
CC
V
IH
V
IL
T
amb
CBT16212_2
Parameter
supply voltage
HIGH-level input voltage
LOW-level input voltage
ambient temperature
Conditions
Min
4.0
2.0
-
Max
5.5
-
0.8
+85
Unit
V
V
V
°C
4 of 12
operating in free-air
Rev. 02 — 3 November 2008
−40
© NXP B.V. 2008. All rights reserved.
Product data sheet
NXP Semiconductors
CBT16212
24-bit bus exchange switch with 12-bit output enables
9. Static characteristics
Table 6.
Static characteristics
T
amb
=
−
40
°
C to +85
°
C.
Symbol
V
IK
I
I
I
CC
∆I
CC
Parameter
input clamping voltage
input leakage current
supply current
additional supply current
Conditions
V
CC
= 4.5 V; I
I
=
−18
mA
V
CC
= 0 V; V
I
= 5.5 V
V
CC
= 5.5 V; V
I
= V
CC
or GND
V
CC
= 5.5 V; I
O
= 0 A;
V
I
= V
CC
or GND
per port select input pin; V
CC
= 5.5 V;
one input at 3.4 V, other inputs at V
CC
or GND
port select input pins; V
I
= 3 V or 0 V;
V
CC
= 5.0 V;
V
CC
= 4.0 V
V
I
= 2.4 V; I
I
= 15 mA
V
CC
= 4.5 V
V
I
= 0 V; I
I
= 64 mA
V
I
= 0 V; I
I
= 30 mA
V
I
= 2.4 V; I
I
= 15 mA
[1]
[2]
[3]
All typical values are measured at T
amb
= 25
°C.
This is the increase in supply current for each input that is at the specified TTL voltage level rather than V
CC
or GND.
Measured by the voltage drop between the A and the B terminals at the indicated current through the switch. ON resistance is
determined by the lowest voltage of the two (A or B) terminals.
[3]
[3]
[2]
Min
-
-
-
-
-
Typ
[1]
-
-
-
-
-
Max
−1.2
10
±1
3
2.5
Unit
V
µA
µA
µA
mA
C
I
C
io(off)
R
ON
input capacitance
-
-
-
-
-
-
4.7
11.5
-
4
4
6
-
-
21
7
7
12
pF
pF
Ω
Ω
Ω
Ω
off-state input/output capacitance V
O
= 3 V or 0 V; V
CC
= 0 V
ON resistance
10. Dynamic characteristics
Table 7.
Dynamic characteristics
T
amb
=
−
40
°
C to +85
°
C; V
CC
=
4.5 V to 5.5 V;
for test circuit see
Figure 6.
Symbol
t
pd
t
en
t
dis
[1]
[2]
[3]
[4]
Parameter
propagation delay
enable time
disable time
Conditions
input A or B to output B or A; see
Figure 4
port select input to output A or B;
Figure 5
port select input to output A or B;
Figure 5
[1][2]
[3]
[4]
Min
-
2.4
2.4
Max
0.25
8.0
8.0
Unit
ns
ns
ns
This parameter is warranted but not production tested. The propagation delay is based on the RC time constant of the typical
ON resistance of the switch and a load capacitance of 50 pF, when driven by an ideal voltage source (zero output impedance).
t
pd
is the same as t
PLH
and t
PHL
.
t
en
is the same as t
PZL
and t
PZH
.
t
dis
is the same as t
PLZ
and t
PHZ
.
CBT16212_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 3 November 2008
5 of 12
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